Callie's psychotic, prankster ex-boyfriend escapes from an asylum and wreaks havoc on Mark's life.

Callie's psychotic, prankster ex-boyfriend escapes from an asylum and wreaks havoc on Mark's life.

A rabid Bat Boy takes a bite out of Mark, transforming him into New York City's latest superhero.

A rabid Bat Boy takes a bite out of Mark, transforming him into New York City's latest superhero.

Lady Hoo-Ha, America's most adored pop star, goes zombie, and her many devoted fans follow suit.

Lady Hoo-Ha, America's most adored pop star, goes zombie, and her many devoted fans follow suit.

Callie is promptly promoted after turning into a man, causing strife in her relationship with Mark.

Callie is promptly promoted after turning into a man, causing strife in her relationship with Mark.

Twayne quits after getting roasted at his DOI 10-year anniversary party, leaving Mark in charge.

Twayne quits after getting roasted at his DOI 10-year anniversary party, leaving Mark in charge.

Randall's new arm lands him on the DOI's intramural football team, and Callie pimps out Leonard.

Randall's new arm lands him on the DOI's intramural football team, and Callie pimps out Leonard.

A Lilliputian arsonist escapes Mark's custody and finds an unlikely hiding place in Twayne's nose.

A Lilliputian arsonist escapes Mark's custody and finds an unlikely hiding place in Twayne's nose.

Grimes' judgmental mother rises from the dead, and a neglected Randall reconsiders his living situation.

Grimes' judgmental mother rises from the dead, and a neglected Randall reconsiders his living situation.