During the mission to free the mutated populace of New York from Dimension X, Slash returns leading his own band of mutants.
- Achievements in Ignorance: Mikey's attempts at creating new Retro Mutagen for the human/kraang hybrids works.
- The Bus Came Back: Slash, Leatherhead, Pigeon Pete, Dr. Rockwell, Kurtzman, and surprisingly Kraang Sub-Prime (along with his Irma disguise) all make their return, as do the Kraathagatrons and Kraang apes.
- Continuity Nod: Slash and Leo carry a lot of tension; Slash from the resentment he built up listening to Raph's one-sided stories about Leo for years, and Leo for the brutal beat down Slash gave the Turtles when he debuted.
- Five-Man Band: The Mighty Mutanimals form one.
- The Leader: Slash
- The Lancer/The Big Guy: Leatherhead
- The Smart Guy: Dr. Rockwell
- The Heart: Pigeon Pete
- Big Good: Kurtzman
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One-Scene Wonder: The Dracodroid; it's a two-headed robot dragion! - Shout-Out:
- Slash calls a Kraang ape a "darn dirty ape"!
- Kraang Sub Prime shouts "Here's Kraangy" while trying to get to the turtles
- Suddenly Voiced: Dr. Rockwell speaks for the first time, as a result of Kraang experimentation on him, and having regained his intellect.
- Surrounded by Idiots: Kraang Sub Prime feels this way with the generic Kraangs still speaking broken English.
- Ungrateful Bastard: Lampshaded by Leonardo after the couple he saves call him an alien turtle and run away.
- Took a Level in Badass: The first time we saw him, Pete didn't seem to have any combat potential, he quickly fixes that in this episode.
- Took a Level in Jerkass: Rockwell becomes a near borderline Insufferable Genius towards Donatello.
- What Happened to the Mouse?: Kraang Prime is nowhere to be seen.
- In terms of items, Slash's plutonium teleporter from Newtralized is never seen.
