Felix goes into a frenzy when the responsibility of hosting the Unger family Christmas falls onto his plate after his perfectionist mother bows out. Meanwhile, Oscar tries to convince his roomie's mom to give her son a break.
Oscar and Felix deal with their issues by seeking the advice of a counselor in their apartment building. Meanwhile, their friends' lives become more complicated thanks to Oscar's opinions on relationships and Felix's meddling.
Dani is thrilled to be receiving a promotion from Oscar, until he gives her the less-than-desirable task of finding her own replacement. Meanwhile, Felix tries to plan the perfect surprise for Emily after she admits missing England.
Oscar sets out to prove to Charlotte how he's capable of being responsible when he volunteers to take her son Caleb trick-or-treating on Halloween, while Felix celebrates the holiday by leading the kids in their building on a haunted history tour.
Oscar rashly enlists Felix to help him save his favorite hangout, which is in financial trouble. But ends up regretting asking for that favor from his roommate when Felix tries to put his stamp on the restaurant.
In the Season 3 premiere, Oscar faces a true dilemma when he's forced to choose between his romantic plans with Charlotte and helping keep a distraught Felix from completely falling apart after Emily decides to extend her stay in London.