After Oscar and Felix become obsessed with eavesdropping on their bickering neighbors, they try to subtly intervene and help them save their marriage. Also, Emily and Dani's friendship is tested when they train together to race to the top of the Empire State Building.

With the help of Murph, Oscar decides to throw a big party when Felix finally agrees to spend the weekend away. Also, Felix and Emily have their first sleepover.

Oscar faces a personal dilemma when he dates a young nanny, Allyson, who works for his neighbor, Charlotte. Also, Emily forces Felix to participate in an activity she's interested in, for a change.

Oscar's dream comes true when he is asked to throw out the first pitch at a New York Mets game. Also, Felix surprises Oscar and invites his father to be there for the big day.

Oscar attempts to impress Charlotte by purchasing a table for a fundraiser to benefit The New York Philharmonic. At the event, Felix reminds Oscar about the importance of being honest and Teddy introduces his wife, Diane, to Dani for the first time.

Oscar and Charlotte hit a speed bump when they hesitate to take their relationship to the next level. Also, Felix attempts to overcome his fear of dogs with Teddy's help when Emily regains custody of Biscuit.

Oscar reluctantly agrees with his agent that it’s time to shake things up on his radio show and allows Dani to have a bigger role after a rival host, Rich Eisen, taunts him. Also, Felix is eager to meet Emily’s mother, Judy (Joanna Cassidy), but things don’t go as well as he hoped.

Felix attempts to reverse Emily's birthday curse and plans a nice dinner to celebrate with friends. Also, Oscar and Charlotte face another obstacle in their relationship when Oscar meets Charlotte's son, Evan (Caleb Brown).

Oscar learns that Felix was nationally ranked chess player as a child and convinces him to return to the game to make money. Also, Emily investigates why Felix is acting strange since he began playing chess again,

Felix forces Oscar and Emily to go on a date to get to know each other better in the hope that they’ll become friends. Also, Teddy agrees to help Dani with her first contract negotiation.

In an attempt to surprise Emily, Felix gets his learner’s permit and enlists his friends to help him learn how to drive. Also, Oscar is annoyed that Felix doesn’t ask him for help,

Oscar and Felix run a heated campaign for president of their building’s tenants’ association, but Oscar doesn’t fully realize everything the position entails.

After Murph persuades Oscar to try online dating, Oscar finds himself on a blind date with Felix’s ex-wife, Ashley.

After their marriages fail, Oscar and his former college roommate, Felix, decide to live together.

Felix offers his help when Oscar is hired to ghostwrite a retired baseball player's autobiography.

When Oscar realizes he forgot Felix's birthday, he plans an impromptu surprise party.

Dani wishes she had a boyfriend for her high-school reunion so Oscar, Felix and Ted work on finding her a man.

When Oscar and Felix attend the wedding of an old college friend, Oscar aims to reconnect with an old flame while Felix is determined to show his ex-wife that he’s a changed man.

Felix’s hypochondria kicks into overdrive when Oscar starts dating the most important person in Felix’s life – his doctor.

Felix convinces Oscar to appear on a sports television show against Teddy’s advice to stick with radio.

When Oscar feels threatened by Felix’s surprising performance on the softball field and basketball court, they agree to a decathlon to determine which one of them is the better athlete.

When Oscar and Felix make a trip to Ashley's to retrieve Felix's special pillow, a secret that he has kept from Oscar is revealed.

When Felix substitute teaches a yoga class, his teaching style rubs everyone, including Emily, the wrong way. Also, Oscar and Dani get trapped on a subway car, adding to their frustration about living in the city, and Murph asks Teddy to be his agent when he’s approached to be the spokesperson for a Norwegian health supplement.

Oscar becomes weirdly obsessed with living up to Murph’s reputation when he finds out that the girl he is seeing used to date the handsome ex-baseball player.

When the IRS decides to audit Oscar and his ex-wife, Gaby, Felix offers to mediate between the contentious exes and suddenly realizes that he might be the reason Oscar was audited in the first place.