Oscar is forced to choose between his romantic plans with Charlotte and helping to save Felix’s relationship as Emily decides to extend her stay in London and Felix starts to fall apart.

When Oscar learns that his favorite hangout, Langford’s, is in financial trouble, he impulsively asks Felix to help save it, without considering the disastrous consequences. Also, Felix tries to make his mark on the restaurant when the owner, Fred Langford , puts him in charge for a few days.

Oscar sets out to prove to Charlotte how he's capable of being responsible when he volunteers to take her son Evan (Caleb Brown) trick-or-treating on Halloween, while Felix celebrates the holiday by leading the kids in their building on a haunted history tour.

Oscar reconnects with many significant people from his father's life when he agrees to carry out Walter's last request to spread his ashes behind the candy factory he once owned.

Dani's excitement at being promoted is cut short when Oscar tasks her with the daunting job of hiring her own replacement. Also, Felix tries to plan the perfect surprise after Emily admits she misses England.

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 arranges for Felix to replace him on any cultural outing that Charlotte has planned; and Emily recruits Dani, Teddy and Murph for help making 100 necklaces for an event.

Oscar grumbles when Felix helps Dani prepare for a choir solo and encourages the group to attend church to support her.

After a heated argument, Oscar and Felix decide it might be best to change their living arrangements and find new roommates.