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(Ep. 217) "Fools For Love" **Season Finale**
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- Mark chooses April Fool's Day to ask Callie to take their relationship to the next level, but his romantic gesture is threatened when Callie's vengeful ex-boyfriend returns to win her back.
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(Ep. 216) "The Dork Knight"
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- Mark becomes a masked crimefighter after he's bitten by a rabid Bat-Boy. With the help of his loyal sidekick, Koala Man, Mark wages war against New York's criminals and their catlike leader.
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(Ep. 215) "The Stalking Dead"
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- Randall becomes jealous when Mark befriends a new zombie. Guest starring Dan Fogler.
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(Ep. 214) "Mark Loves Dick"
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- Mark becomes conflicted about his relationship with Callie after she turns into a man. Guest starring Jon Benjamin and Ed Helms.
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(Ep. 213) "The Roast of Twayne The Boneraper"
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- In honor of Twayne's 10-year anniversary of running the D.O.I., Callie and the crew throw him a Roast. But when Mark's attempt at edgy humor goes too far, Twayne quits, leaving Mark in charge.
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(Ep. 212) "Any Given Workday"
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- With the big company intramural football game around the corner, everyone starts getting nervous about the lineup. When Randall demonstrates the power of his recently replaced arm, he is given a job as the team's ringer.
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(Ep. 211) "Journey to the Center of Twayne"
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- An ant-sized arsonist named Jerry flees Mark's custody, escaping up Twayne's nostril. A miniaturized Leonard, Grimes and Mark must track Jerry through Twayne's body to bring him to justice.
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(Ep. 210) "Mummy Dearest"
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- Grimes's Mummy returns from the dead, only to find fault with everything Grimes is doing.
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(Ep. 209) "Lilly and the Beast"
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- Callie reveals to Mark that she's been sleeping with other guys. So when Mark's college girlfriend shows up, he decides to put his newly "open relationship" with Callie to the test.
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(Ep. 208) "Little Ship of Horrors"
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- Twayne throws a company party aboard a cruise ship, where Randall is introduced to a strange plant species. Randall gets sick from its dangerous pollen, and finds that Mark holds the key to his survival.
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(Ep. 207) "Wail Street"
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- Randall puts Mark's soul up for sale on the Soul Exchange, and finds interested buyers in Callie and Aldermach. Meanwhile, Grimes pursues his dream of creating a pop music act with a new teen sensation.
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(Ep. 206) "Attack of Mark’s Clone"
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- Callie decides to makes a clone of Mark so that the DOI Bowling Team will win their tournament. But when Clone Mark finds a cruel message in Callie’s secret diary, he decides to get revenge by framing her for murder.
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(Ep. 205) "The Ring of Powers"
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- Mark finds a magic ring in Leonard’s desk drawer. When he puts it on, he mistakenly activates an engagement that Leonard put on ice centuries before, when dragonsroamed the earth.
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(Ep. 204) "G.I. Twayne"
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- Twayne is drafted into Satan's Dark Army. When Mark is forced to join him, he unwittingly discovers a plot to end humanity.
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(Ep. 203) "Ride Me To Hell"
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- Grimes loses it when his favorite TV series ends with a stupid twist. Mark helps him unravel his attachment to the show, uncovering a deep seated memory along the way, while amateur filmmaker Randall documents the whole thing.
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(Ep. 202) "Callie and Her Sister"
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- Callie's parents get back together and have a new baby. But when their marriage falls apart again, Callie must play guardian to this younger, hotter spawn of the devil.
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(Ep. 201) "Wet Hot Demonic Summer"
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- Twayne and Callie must infiltrate a secret Wizard compound where Leonard is training his apprentice. But their complicated strategy involves building a summer camp on a moment’s notice, with Mark Lilly as their head counselor.
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