S1, E5: After an argument over whether or not Alex (Chris D'Elia) uses a condescending "tone," Whitney (Whitney Cummings) decides she is going to catch her boyfriend in the act and enlists Mark's (Dan O'Brien) help. The two scheme to set up a hidden camera in the couple's apartment. Lily (Zoe Lister-Jones), Roxanne (Rhea Seehorn) and Neal (Maulik Pancholy) gather around the television to watch the drama unfold. Later, Alex's brother Brian (Ken Marino, "Party Down") crashes on the couch, and old sibling rivalries come to the surface causing the two brothers to brawl.