Revenge of Nega-Catboy!

Revenge of Nega-Catboy! is the 12th episode of Season 29.

Summary
Feeling that his friends never forgive him for his mistakes, Catboy crosses to the dark side again to join Lady Rancora and becomes Nega-Catboy, again, and this time, not even love can break her spell. Now Owlette and Gekko must convince their friend to come back to them, but it’ll take only the power of forgiveness to set Catboy free from his negativity.