Callie goes baby-crazy when Mark fosters a demon orphan, and Twayne notices odd changes in his body.

Mark accidentally outs Randall as a zombie, and Leonard tries to identify a strange new creature.

Mark helps an old tree get its groove back, and Randall loses his favorite non-vital organ.

Mark walks a young couple through the trials of vampire love, and "Larry King disease" ravages New York City.

An obsessive-compulsive giant ape needs a job, and Callie struggles with her sudden attraction to Twayne.

Randall joins a zombie cult, and Mark performs psychiatric evaluations on his coworkers.

Mark helps Leonard with his magic wand issues, and Twayne Boneraper meets his two-dimensional soulmate.

Councilman Fitzpatrick sells his soul to Twayne, and Callie considers a cushy job in Hell.

Mark and Randall spend Halloween with Callie's family, and Leonard tries to find people to live in a haunted house.

Randall shambles his way onto an all-creature reality show, and a troll wrestles with riddle addiction.

Mark and Randall teach a sexed up robot self-control, and Callie mixes up Mark in a demonic ritual.

Manbird season hits New York City, and Mark finds himself the guardian of a fledgling separated from its flock.

Callie must care for her younger, hotter demon sister, who happens to be engaged to Twayne.

When his favorite TV series ends with a dumb twist, Grimes has a complete mental breakdown.

After being drafted into Satan's dark army, Twayne and Mark must do their patriotic duty and end the world.

Mark accidentally reactivates Leonard's magical arranged marriage.

Callie makes an evil Mark clone to compete in the DOI bowling league tournament.

Randall tries to make a quick buck on the Soul Exchange by selling off Mark's immortal soul.

Randall is infected by horrifying plants at sea when Twayne throws a cruise ship party.

Mark hooks up with an old girlfriend to test his open relationship.

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

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

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

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

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