After eluding capture and disappearing years ago, the famed Yin Yang serial killer is back, and he's set his sights on Shawn. Cybill Shepherd and Rachael Leigh Cook reprise their roles in the season finale ... and watch for a secret celebrity in the role of Mr. Yang!

Shawn and Gus are hired by a childhood friend to find a missing camp counselor who disappeared near their old sleep away campgrounds. Upon their arrival, spooky activity abounds and they must uncover if the dark past of the abandoned camp has come back to life. And, oh yeah, Justine Bateman guest stars as Lassiter's estranged wife Victoria!

Shawn and Gus must prove a pathological liar is telling the truth in order to stop an assassination plot. Jonathan Silverman guest stars.

Shawn and Gus go undercover at a professional football training camp when the foot of the team's missing kicker is discovered. Mykelti Williamson guest stars as the head coach.

Shawn and Gus join up with a local firehouse to prove a series of arsons are more than they seem. Bruce McGill guest stars.

Shawn and Gus must prove Lassiter's innocence when he's on the hook for a murder inside of the Santa Barbara Police Department.

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 conspiracy. Ted McGinley guest stars.

After Shawn and Gus help a little girl get a mall Santa out of jail in time for Christmas, they realize their clients are con men who have a big score planned. Helping them with their investigation is Gus' sister Joy, in town for the holidays and looking to repeat a one time fling she had with Shawn, who is determined to keep his best friend from ever finding out. Phylicia Rashad and Keith David guest star as Mr. and Mrs. Guster, with John Landis directing the episode.

After Gus finds himself held hostage in a bank, Shawn must not only find a way to get inside, but also to become the gunman's chief negotiator.

Shawn and Gus help Juliet go undercover as a member of a roller derby team in order solve a string of robberies. WWE Diva Mickie James guest-stars in "Talk Derby To Me."