
Raph's glad that both Slash and Rockwell are alright, but Mikey suspects that something's off about them. Once Slash and Rockwell are there, there were treated to soup by Splinter. Noticing that the two aren't looking so well, Donnie suggests that they take Rockwell and Slash back to the lair pronto. However, as they run, an army of Foot-Bots chases behind them, which the Turtles and the rest of the Mutanimal team quickly take out to aid Rockwell and Slash.


The eventually "escape" on their own and aided by both the turtles and their fellow Mutanimals. Fusing the formula into some special, mind-control worms, Stockman picks one up and focuses it towards Slash, making the turtle cry out in pain. Slash secretly works on cutting one of the straps holding him with shell, so that he can bust out later and escape, but his plans are put on hold when Stockman demonstrates just how he plans to administer the serum. Both Rockwell and Slash are not willing at all with being used as experiments and resist. Rockwell and Slash are seen in Baxter Stockman's lab Rockwell and Slash are used in an experiment to test Shredder's mind control serum. Both Tiger Claw and the Foot quickly make off with both Rockwell and Slash, leaving both Pigeon Pete and Leatherhead behind. The twins quickly make their getaway with the cash. The twins fire at them, causing a fight between Tiger Claw and the Mutanimals. In Clash of the Mutanimals, Rockwell along with the other Mutanimals interrupted an exchange between Tiger Claw and the Fulci Twins. He is seen at first being at odds with Donatello about which of them is more intelligent, however after acting out his plan to not only open a portal to Dimension X but also use the portal to teleport the imprisoned New York humans back to Earth while at the same time teleporting the Kraang back to Dimension X Donnie told him that plan was "A stroke of genius". It is revealed that the Kraang experimented on him again, though restored his intellect and his ability to speak. His next appearance is in Battle for New York, where he is shown to be the brains behind Slash's new team the Mighty Mutanimals. After he is freed by Metalhead, he breaks the Kraang droid standing next to his cell, then makes for the portal. Rockwell is next seen in Metalhead Rewired, as one of the detained mutants in the Kraang prison.
MONKEY QUEST TEENAGE MUTANT NINJA TURTLES DRIVER
Despite hearing him get into a fight with an angry driver almost immediately, the Turtles decide Rockwell will be fine on his own. The Turtles set the mutant Rockwell free, and he goes in the street. Falco defeats all the Turtles easily, but Donatello ultimately wins.

The Turtles return to the lab just after Falco injects the psychic neuro-chemical extracted from Rockwell's brain into his own. But later, while studying Rockwell's flash, Donatello learns that Falco has lied to them about Rockwell and used them to get Rockwell back. They return him to Falco, who promises to take care of him.

Once they capture him, April realizes that the monkey is Dr. April and the Turtles later search the city for him. He attacks and defeats Donatello easily, and is about to harm April, but calms down when she talks to him and then runs away. Donatello also takes a flash drive from the lab containing data on Rockwell's research. Falco, who claims that Rockwell had been using mutagen to experiment on monkeys. While in his abandoned lab, they encounter Dr. Victor Falco reported Rockwell missing on the news, Donatello and April investigate his disappearance hoping to find clues about the Kraang.
