JD Pardo

Ryan struggles with the decision of whether or not to invite Marissa to his birthday party, and Sandy wants to include one of Ryan's relatives in the celebration. Meanwhile, Julie and Dr. Roberts come clean with Summer and Marissa.

Julie and Dr. Roberts announce their engagement. Marissa seeks solace with bad boy Volchok. Ryan tries to move on with Sadie, but Seth's concern for Marissa gets in the way.

Ryan visits his mom. Taylor and Summer wonder why Seth is keeping secrets. Julie gives Volchok stern advice. Marissa confronts Volchok's friends and saves a girl.

When parents accuse Veronica of providing a fake ID to their son, who's now in an alcohol-induced coma, and files suit, the search to find who's responsible leads Veronica to a clandestine, exclusive organization operating on Neptune High's campus with a possible connection to Duncan. Meanwhile, Aaron Echolls (recurring guest star HARRY HAMLIN) hires Keith to find out who's supplying pictures to the tabloids that humiliate his wife, Lynn (recurring guest star LISA RINNA). Later, Veronica hides an electronic device in the office of guidance counselor Rebecca James (recurring guest star PAULA MARSHALL) to eavesdrop on grief counseling sessions and learns some surprising information about her friends.

Fed up with Michael's parenting style, the children confront their father with a description of the ideal dad.