GASI has a new recruit: Monkevil, former super villain, and Gus and Wally's long standing crush. Though she excels during training, YAY-OK suspects that she has returned to her life of crime.

When Gus blames YAY-OK for his own mistake during a training exercise, Dr. Chimpsky sends them YAY-OK7, an updated replacement who is quick to assert his superiority over the original model.

Lord Peel seeks revenge on Gus and Wally by impersonating Santa and tricking them.

Gus and Wally discover the truth about Pinky Winky's real size.