Charlie is visited by the ghosts of his ex-girlfriends while Alan and Jake are on a road trip.

After moving in with Lyndsey, Alan continues to have a rendezvous with Melissa at Charlie's house.

Alan goes to great lengths to be able to get Lyndsey a nice birthday present.

Rose and Alan discover each other's secrets. Meanwhile, Charlie's desperate to get some time alone with Rose.

Alan has trouble accepting Lyndsey's seedy movie past, and Walden tries to cheer him up by throwing a party.

Walden receives divorce papers from Bridget, but forgets his depression when he meets a girl who looks eerily like her.

Upon his release from the hospital, Alan is met with a slew of challenges that test his ability to cope.