Mark asks Callie to take their relationship to the next level, but his romantic gesture is threatened when her psychotic, prankster ex-boyfriend returns to win her back.
A rabid Bat Boy takes a bite out of Mark, transforming him into New York City's latest superhero. With Koala Man's help, Mark wages war on the city's criminal underworld.
Callie is promptly promoted after turning into a man, causing strife in her relationship. The gender politics are further frustrated by a trip to Atlantis.
Randall's new arm makes him the perfect quarterback ringer for the DOI's intramural football team. Callie pimps out Leonard to raise money for a new sports car.