Nicole Travolta

Walden starts partying with Jenny and her hot friends. Meanwhile, Alan and Lyndsey's illicit affair is jeopardised.

Charlie begins dating his nerdy ex-girlfriend again, who then hacks into his computer and takes over his life. Lacey launches a plan with Patrick.

Charlie dates a hot techie named Monica, whose ex-boyfriend starts causing a few problems. Lacey's first sales call in her new job doesn't go too well.

Sean gets arrested after decking a man who grabbed Jen's behind, and is required to join Charlie's therapy group - but what's his secret past?