The Rangers believe their work is done after they've defeated Sledge and his evil monsters. Unbeknownst to them, an even more powerful monster is picking up where Sledge left off and is closer to the Rangers than they think.
The group have gone their separate ways and gone back to their old lives; Tyler is looking for his dad once again, Shelby is in college studying business, Chase is back home in New Zealand, and Riley is back working on the family farm. But not all is peaceful in the world. Sledge's ship may have crashed, but its inhabitants are still alive. Aside from Sledge, who is MIA and presumed dead, everyone has survived the crash, and the power vacuum allows a new leader to rise - Snide. Snide quickly kills one of the Spikeballs before he suddenly transforms into Heckyl, whose appearance shocks the remaining guards. Heckyl refers to Snide as his 'other self' and assumes control of the ship, demanding the prisoners be released from their cells and fed. He makes the ship an offer: bring him an Energem and they can rule at his side, or be on their way. One monster chooses the latter, and gets electrocuted for his troubles; Heckyl justifies this by saying they would have been the first to betray them, and this is the result of betrayal.
Riley, Shelby and Chase all get attacked by an unknown enemy, while Tyler's truck is stopped by a flat tyre, courtesy of some icicles in one of the wheels. Spinning around, Tyler spots an old enemy - Iceage, who attacks him, freezing his truck solid. He rings Kendall, but his call gets cut off; this prompts her, Koda and Ivan to go and see what is going on. The three find his truck and get attacked, Iceage freezing Ivan and Kendall. Koda valiantly fights back but without his Energem is outmatched. He is about to be frozen when he slips out of his hoodie and flees, to Iceage's chagrin.
Koda heads back to the Ranger base and tries to contact the other rangers, but his primitive lack of knowledge on Kendall's tech means he can't do more than simply push buttons. Fortunately Tyler had escaped Iceage's attack and headed back to the base for reinforcements. The pair exchange information, and Koda reveals what happened when he fell into the glacier. Despite his fear, he comes up with the plan to trick Iceage, and the two confront the monster. Iceage freezes the morphed rangers and takes them to an industrial site for Snide. When Snide tries to take the Energems from the two, he discovers that it was a facade - only the rangers' suits were in the ice, not the rangers themselves. Using the Dino Blaze charger, the pair defrost the other rangers, and the seven morph to fight off the monsters. In the melee, Tyler fights against Snide, who easily knocks him around, but he quickly retreats when his energy is almost depleted, shifting back into Heckyl.
The rangers are able to defeat Iceage once again, and use the Plesio Pacha-Rex Formation to defeat him when Heckyl is able to use the Magnabeam on him. Afterwards, the rangers meet up with Prince Philip and discuss their new objectives: to find the missing Aqua Ranger, and locate the Silver Energem, as well as stopping the new monster menace.
Tropes:
- As You Know: The final scene involves the Rangers going over how they have eight Energems, but need to find the last two: the Aqua Energem and its wielder (since they know it must have bonded with someone due to the Ankylozord being active), and the still dormant Silver Energem.
- Bad Boss: Heckyl offers the rest of his fellow former prisoners a chance to leave; he then vaporizes one monster who decides to do so.
- Bread, Eggs, Breaded Eggs: "I'll send you a postcard. Or a snow globe. Or a postcard inside a snow globe!"
- The Cavalry Arrives Late: Prince Phillip arrives back at the team's base at the end of the episode, after the rest of the team has already won the day.
- Deader than Dead: Sledge, see below.
- Fantasy-Forbidding Father: Shelby is going to college to become a businesswoman, presumably against her will, because her father doesn't want her to be a paleontologist.
- Faux Affably Evil: Heckyl lets the other prisoners out rather than keeping them confined to their cells (and gets them snacks), and even offers that the monster who got the gems would be able to rule the universe by his side. He then proves he's a heartless bastard by killing a monster who wanted out, even after giving said monster his blessing to leave.
- Flashback: We get a brief look at Kendall and Chase finding Koda and freeing him from the ice.
- Freeze-Frame Bonus: One of the prisoners shown for a split second when Heckyl takes over is Necrolai.
- Giving Them the Strip: How Koda and Tyler escape being frozen.
- Harmless Freezing: Averted; it's only the fact that the Rangers are bonded to Energems that keeps them alive while frozen by Iceage. Doubles as a Call-Back to how bonding to an Energem allowed Koda to survive being frozen for one hundred, thousand years.
- Jekyll & Hyde: Heckyl/Snide's entire schtick: Heckyl is the smart charismatic humanoid who makes the plans, while Snide is the brute who goes in all guns blazing. In a twist, rather than being voluntary, like the original, Snide transforms and reverts at random, and communicates via a pocketwatch.
- Killed Off for Real: Wrench states that without a piece of Sledge's tissue, there's no way to revive him.
- Killed Offscreen: Sledge's death in the crash is not depicted. All we know is that there was apparently nothing left.
- Mook Carry Over: All of Sledge's subordinates and prisoners are now Heckyl's.
- Never Found the Body: Sledge
- Pragmatic Villainy: Heckyl rejected Snide's idea of killing Kendall for a simple reason, he wants the Energems and she's not carrying her's at the time.
- Putting the Band Back Together: Done in a unique way: Rather than calling everyone back together to fight Snide, they are thrust back together when he starts hunting them down.
- The Reveal: Poisandra, Fury, Wrench and Curio survived the shipwreck, but Sledge didn't. Presumably...
- Status Quo Is God: Variation; Sledge is definitely dead and Heckyl/Snide becomes the new Big Bad, but the Rangers all get back together at the end (including Phillip) and apparently just abandon their old lives again after Iceage kidnapped them. In all fairness, they have no clue about Heckyl's dual identity and also (perhaps) don't know that Sledge is no more.
- Why Did It Have to Be Snakes?: After being frozen in ice for thousands of years, Iceage's attack is Koda's personal nightmare.
