Judith Moreland

Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.

Leslie puts together a task force at the mayor's request to catch a possum at the golf course; Mark forces Ron to get his personal building up to code.

The squad are led into a psychological game with a budding serial killer, who challenges them to solve a series of complicated clues in order to prevent the murder of his next victim.

Owen organises a baseball game against Seattle Presbyterian; Lexie is unable to control her emotions when she sees Mark with a new woman; Alex fights for Zola; Richard talks to Meredith and Bailey about their feud.

A mysterious dead man is found in a crater, his body flattened as if he had fallen from the sky. Brennan and Booth try to find out who the man was, while Hodgins comes up with different conspiracy theories involving aliens.

After a street artist's mural is stolen, the investigation soon leads the team to a conspiracy involving a Navy contractor and ocean mammals.