Will takes Marcus to the ER after an accident with a knife.

Fiona oversees a project for Marcus' class. Later, Marcus goes on a shopping spree with Will.

Will invites Sam to a game night hosted by Andy and Laurie.

Marcus' dad makes a surprise visit. Meanwhile, Sam's demanding work schedule leaves little time for romance.

Scheduling problems arise as Will tries to plan a birthday party for Marcus. Meanwhile, Fiona and Sam get into a disagreement.

Will invites Sam to move in with him after she is forced to evacuate her apartment. Later, Will and Marcus build a tree house.

Will turns to Andy for advice after Sam gets a job offer in New York in the Season 1 finale.

Will returns to sort out a few things but ends up staying longer than planned when he sees Marcus's new "friends".

Will is told to sell his San Francisco home in order to solve his money issues. So he decides to find Marcus a brand new best friend.

Will orchestrates his yearly halloween extravaganza and fiona finally lets her hair down.