Black Clover has an unusually high number of these. Episodes 29, 66, 102, 123 and 124 are all full episode recaps, the majority of episode 157 is a recap, and episode 82 consists almost entirely of post-episode humor segments from previous episodes.
All clips used in Episode 123 were flashbacks in their original episodes, making it a very literal example of a Clip Show which is also a Whole Episode Flashback.
Though it is not the whole episode, the first half of Episode 152 is a Flashback Echo which not only uses clips from previous episodes as flashbacks, but also makes generous use of Stock Footage from previous episodes as well as slightly updated Recycled Animations.
The Macross segment featured two clip show episodes adapted directly from the Japanese series, which had to use clip shows to fill space after its order was suddenly expanded from 23 to 36 episodes early in the season. One episode had an expertly edited dream sequence episode formed mainly of clips, with new dialogue, which flowed into each other in a very accurate rendition of dream logic. The other was the episode "Gloval's Report," which is pretty much exactly what it sounds like: Captain Gloval reporting the major milestones of the series thus far to his superiors. ("Gloval's Report" was also expanded into a Compilation Movie, Codename: Robotech, for broadcast to build interest in advance of the show beginning its syndication run.)
The New Generation episode called "Sandstorm" is another clip show adapted directly from the original series. Another New Generation episode gained a several-minute recap segment at the beginning when several minutes of nudity were deleted from the original series's Hot Springs Episode.
Another clip show was the episode that linked the Macross segment to the Robotech Masters segment. This episode was created entirely from other episodes' content by the American translation company, which needed to fill an episode's worth of space to pad the count out to a divisible-by-five number to better fit into weekday syndication.
Around the middle of Transformers: Energon, there was a mostly clip episode for no particular reason.
Ditto for the original series (at least the dub) of Yu-Gi-Oh!
Yu-Gi-Oh! The Abridged Series took that episode and ran with it. All the lines (except the flashback to the opening credits) were new.
That episode was in the original Japanese version as well. There were also two others: episodes 144 and 184. 144 took place in between the Battle City and anime-only Doma arcs that had Tea (Anzu) and Serenity (Shizuka) reminiscing about the events of the Battle City Tournament as well as when Noah took them hostage. Episode 184 ended the Doma storyline, but actually spent most of it having the characters in the arc remember what happened in the past 40 episodes.
In "Candid Kitty," the bad guys watch clips of earlier episodes in a movie theatre, hoping to find the Pizza Cats' weakness.
In "Big Cheese's High Definition TV," the bad guys watch clips of earlier episodes on a new TV, this time focusing on the giant robots they used in the past, deciding what bits to use as they create a more dangerous robot with all the best aspects of the earlier robots.
"The Cats Cop Cartoon Careers!" is the series finale, where the cast look back on the series.
In the original Japanese run there were 54 episodes, but Saban only dubbed 52. The two episodes left out were clip shows, hence why they were skipped over in the US.
Pokémon: The Series held out for eight years before creating a clip show — a mash-up of scenes from the then-current arc's important battles that wasn't even edited to make the music flow. The dub just skipped it, and its six later successors, because what kid in the U.S. would want to watch a Pokémon clip show?
The last episode of the first Story Arc was a clip show narrated by the as-yet-unrevealed Big Bad.
And the last episode of the second arc was a joke clip show about a secondary character. And the last episode of the third arc was a clip show interspersed with a narration by the main character revealing that she slept with Akio.
Mobile Suit Gundam SEED uses this a few times during the show's run. 3 episodes out of 50 are clip shows. Mobile Suit Gundam SEED Destiny has even more. Some are really annoying. Episode 29 is a decent example of how to do one of these right.
Episodes 15-18 of Wolf's Rain. It seems several months passed after episode 14, so it was deemed necessary to recap pretty much the whole thing (that or a low budget). On the American DVDs, the four episodes filled an entire volume (vol. 4: "recollections"). It retails for $30, and the average rating on Amazon is one and a half stars (as opposed to five stars for vol. 3).
The Transformers series Car Robots has three clip shows; when it was dubbed into Transformers: Robots in Disguise those episodes remained clip shows, but the clips involved were completely different. In at least one case this was probably an attempt to show scenes that hadn't aired because the episode was released after 9/11.
Transformers Victory had no less than six over the course of its run, with another four added for the video release. Since these episodes contributed nothing to the plot, they were omitted from the UK/Australian DVD releases.
Trigun's 13th episode, "Vash the Stampede", is a clip show episode wherein Meryl is typing her report on Vash and summarizing all that she has witnessed since following him.
Right after a dramatic moment in the CP9 arc that was preceded by a four-episode flashback, the arc decides to pause again while the heroes falling in mid-air for fiveClip Showepisodes in a row (episodes 279-283). When these episode originally aired they coincided with a timeslot change from evening to morning, so this might have been an attempt to combat Continuity Lockout for new viewers (the final episode recaps the flashback that started only nine episodes prior). While these episodes got their own DVD in Japan, they were sold/broadcast the same any other episode internationally.
Used again during the Thriller Bark arc (Episode 354). Again, probably an attempt to avoid Continuity Lockout, as this arc follows on from a storyline that hadn't appeared in almost three hundred episodes.
The original broadcast version of episode 6 (the Hot Springs Episode) had to cut down a subplot of Kamina and Simon trying to peak at the girls, and added scenes of characters remembering previous events to fill in the extra time. (After the original episode had been completed but before it could be aired, the show was moved from a late-night timeslot to an early-evening timeslot, meaning it would be reaching a younger audience than was originally intended.) The unedited episode was included on the DVDs.
Episode 16 is a regular Recap Episode using clips from before the Time Skip. Oddly, this apparently didn't fill up a regular production slot, making the show 27 episodes instead of 26. The clips occur completely out of universe, not only lacking a Framing Device, but actually showing live action time compressed footage of artists making the episode's packaging.
Mobile Suit Gundam Wing had a pair of back-to-back clip show episodes, 27 ("The Locus of Victory and Defeat") and 28 ("Passing Destinies"), which have Relena and Treize (respectively) each recapping half of the story so far. It was later revealed that these episodes were going to show important moments from the main characters' pasts, but those plans fell through; these stories were later turned into the manga Episode Zero.
The first half of episode 14 is one of these, with the SEELE committee narrating the events of the series so far.
The first 70 minutes of Death and Rebirth is a clip movie.
Eureka Seven's episode 14 is one of these, with the events narrated in the form of various reports written by two cast members.
The first Fist of the North Star anime series had a clip show for its series finale, actually called "A Look Back! The 2000 Year History of Hokuto"... despite only recapping the series' events; the "proper" series finale had been the penultimate episode. Fist of the North Star is rife with these, unfortunately. There were several episodes that were nothing but clip shows, including one notorious incident where five episodes in a row were just clip shows. Fully half of the penultimate episode was a recap clip show of the antepenultimate episode.
Throughout the two-year filler period that Naruto Part 1 aired, only one episode, 202, was a clip show. It was based on a viewer vote of the best five fight scenes, and ended with cameos of Jiraiya, Orochimaru, and Sasuke.
Naruto Shippuden gave us a double-length clip show with episodes 212 and 213. A handful of plot developments were thrown in between the flashbacks, but the two episodes had barely 10 minutes of new footage between them.
Code Geass had two Clip Show episodes in the first season, but unlike many such examples, the staff outright admitted that they were Filler episodes intended to buy them some "breathing room" so they could work on more plot-relevant episodes. These two episodes didn't even make it into the American release, becoming Missing Episodes.
Chobits managed to have three clip episodes, two of which aired with the original broadcast, and one of which was made for home video. And at least in the North American DVD release, all three were included on the final volume, which also included the "Chibits" short.
His and Her Circumstances had a clip show that actually lasted one and 1/2 episodes of its 26 episode run.
Fullmetal Alchemist: Brotherhood had an interesting take on this for episode 27, with a clip show brought on by the framing device of a very strange dream by Hohenheim.
Samurai Champloo had one in episode 13 when Mugen and Jin read Fuu's diary, which sees her personally recapping the events of the past 12 episodes.
A notable one happened in episode 89 of Sailor Moon. It featured only voiceovers of the five main senshi discussing the events of the season and pondering the future while clips from the entire series played out.
Dragon Ball Z had a clip show in 1993 as a year-end special, where Goku (who is at that point deceased) decides to visit Earth to spend New Years with his family, and they reminisce about everything that happened in the anime that year, mainly the Cell Games and the Otherworld Tournament. This was never aired outside of Japan, because what person outside Japan would want to watch a DBZ clip show.
In the primary show content, the idea was played with a little. For filler the anime would often have scenes taking place away from the action where characters would reminisce about events from both DBZ and Dragon Ball and could range anywhere from five to ten minutes. For example, late during the Goku/Freeza fight after everyone else gets teleported back to Earth by Porunga there's an episode that devotes a little bit of time to have Piccolo think back on his past with Goku, which then features clips of mainly from the Piccolo storylines from Dragon Ball. Another episode has Master Roshi explain the history of the Red Ribbon Army to some of the supporting cast hanging out on his island early on during the Android saga, which in turn features clips from the entire Red Ribbon Army arc from the original Dragon Ball. Given the length of the series, those flashbacks were probably included because the people making the anime thought people legitimately wouldn't remember (or wouldn't even have seen) stuff that was important to a new plot. They became particularly important when the show was exported to America, because everything past the first 13 episodes of Dragon Ball weren't dubbed until later.
In Japan, there was the "Summer Vacation" Special that played with the trope by applying it to the movies: Goku, Gohan and friends are dressing up for the 1992 premiere of Dragon Ball Z: Super Android 13!, and spend their time reminiscing about all six previous DBZ movies and the three Dragon Ball movies before them.
Miami Guns did a clip show for its second episode, though in this case it was entirely new content with no flashbacks to the first episode. It also broke the fourth wall inconsistently, with the lead characters sometimes talking about behind the scenes stuff like Animated Actors and sometimes treating the clips as the actual events of their lives.
A portion of episode 73 of the Fairy Tail anime (adapted from the manga's "Rainbow Sakura" omake) features Lucy reminiscing a bunch of events from the previous 72 episodes while she's sick in bed.
The first half of episode 26 of Death Note is this, through the frame of L's reports on the Kira case, which Light subsequently finds and deletes.
Episodes 19 through 22 of Supercar Gattiger were composed of clips from earlier episodes.
Full Metal Panic! Invisible Victory did two clip show "half-episodes" within the first eight episodes...out of a total of twelve episodes. Fans were not pleased.
The Love Live! Sunshine!! anime's final episode utilizes this technique for the song "WONDERFUL STORIES", where the choreography is comprised of clips from the musical performances of every single episode, from "Kimeta yo Hand in Hand" to "WATER BLUE NEW WORLD".
The first half of the Sword Art Online OVA. Kirito talks to a government agent recalling events in the game world through his perspective. Meanwhile, the girls talk about their various interactions with Kirito, which essentially shows important parts where they interacted with him, in-between teaching Suguha how to swim.
Smile PreCure!: The Glitter Force edit of Episode 30 uses some clips from previous episodes when the girls flashback to some of their fights with the Bad End Trio. This notable causes Majorina/Brooha to appear in the edit, when she was absent from the original cut of the episode.
Healin' Good♡Pretty Cure episode 26 is an episode recapping the events of the previous 25 episodes.
Episode 14 recaps Chacha's continual victories over Daimao's minions while Sorges tries to figure out how to beat her.
Episode 26 is a recap of Episode 3 with the in-universe framing of Yakko visiting Chacha while she tends to Seravy's house.
Episode 40 is a recap of Chacha getting the Phoenix Sword with Shiine reminiscing over breakfast.
Episode 51 is mostly a recap of all the important episodes while Chacha reflects on her victory over Daimao.
Finally, Episode 65 is a recap of all the episodes Dr. Mikeneko appeared in as he prepares to fight Chacha again- unaware that the world is at peace and that there is no one is fighting anymore.
Subversions and parodies:
The second episode of Miami Guns was one of these, that reviewed episodes from an imaginary first season.
Subverted in Seitokai Yakuindomo. The final episode starts its second half with what appears to be a regular clip show. Then things start getting strange when characters flash back to events that didn't happen the way they happened. In Mutsumi's case, events that weren't even in the same genre. And it gets weirder; apparently Tsuda's souvenir actually changed to conform to Shino's warped memory, causing Tsuda to go into a short Heroic BSoD. That the whole thing is topped off with a preview for the show that will be taking their time slot (that also doesn't exist) cements the show taking a sledgehammer to the fourth wall.
Parodied on Kill la Kill—episode 16 begins narrated by Senketsu, declaring this to be "the recap episode you knew was coming." (This show was made by the same people as Panty and Stocking and Gurren Lagann, listed above.) He then summarizes all the previous episodes in two minutes, teases the audience for thinking that he was serious, and compliments the show on how its fast pace made this go so quickly. Bonus points because the actual episode that follows includes several revelations that puts the previous episodes in perspective.
Excel♡Saga had two of these despite only running for 26 episodes. The first was halfway through the series and was about half and half between old and new content (with the premise of a New Year's gameshow that had clips for some reason), while the second was about five episodes later and recapped the Pedro storyline, consisting almost entirely of recycled content up until the end when the storyline was expanded on a bit. Naturally, since this is Excel♡Saga, it was parodied: Not all the clips shown play out like they did in the episodes which turns "remember that time" into a form of Unreliable Narrator.
, 21 (Embers of a New Battle)