One of Billy's friends with muscular dystrophy dies forcing the realization on the guys that Billy doesn't have much time left. Jim copes by chasing after the dead guy's sister.
When Jim and Steve attend their high school reunion, they find things aren't quite as they remembered. Billy tags along and poses as an able-bodied alumnus.
The van is towed with Billy in it while Walter and Steve go out drinking. Billy's wheelchair is stolen by gang members and Jim and Steve help him get it back.
Steve falls off the wagon and goes on a bender, leaving Jim and Billy to care for Emily during his visitation with her, after discovering his ex-wife is pregnant and plans to remarry.
Jim stops drinking in solidarity with Steve and starts to suffer from panic attacks. Through a misunderstanding, Jim ends up at a married ex-girlfriend's house for a costume party.