When Shabby the sea lion is found dead after being released into the wild, Shawn sets out to prove it was murder and stumbles onto a bigger mystery.

Charlie’s young, hot girlfriend takes him to a new club. She invites Alan to meet one of her friends but the men are shocked to learn that they are considered…

After reconnecting with Kate, Walden becomes convinced she is the one for him — until he meets a woman named Vivian (Mila Kunis).

Walden gets an invitation to his ex-girlfriend’s boutique opening. Meanwhile, Gretchen wants to spend more time at Alan’s (a.k.a. Jeff Strongman) house.

After reconnecting with Kate, Walden becomes convinced she is the one for him — until he meets a woman named Vivian (Mila Kunis).

Walden gets an invitation to his ex-girlfriend’s boutique opening. Meanwhile, Gretchen wants to spend more time at Alan’s (a.k.a. Jeff Strongman) house.

Depressed on Valentine’s Day, Walden tries to talk Kate into giving him another chance; Alan’s holiday plans go south.

Alan and Walden go to Kate’s fashion show in New York so Walden can reveal the truth about his identity.

Alan invests Walden’s money in Kate’s fashion line; leading a double life takes its toll on Walden.

Walden juggles his two identities; Alan ends up alone on Christmas.

Alan helps Walden create a new identity so he can avoid women who are only interested in his money.

The gang thinks that Barney must have a secret girlfriend after noticing his bizarre behavior.

With Wolowitz AWOL with one of her friends, Penny’s recruited to fill in for him on the guys’ Halo team