Guest Appearances

Jane upstages a drama teacher when he and Lisbon investigate the murder of a popular teacher on a school campus.

The battling Pied Piper and Hooli face binding arbitration; Jared, Dinesh and Gilfoyle debate philosophy and live-streaming.

Richard locks horns with Dinesh when his success goes to his head. Meanwhile, Erlich is interested in Jian-Yang's new app, and Gavin becomes paranoid.

The guys await the verdict on Pied Piper's fate; an unexpected drama causes a spike in traffic.

Counsellor Troi is swept off her feet by a dashing but conniving alien delegate.

After Tony's identity is stolen by multiple perpetrators, the fake special agent DiNozzos begin blackmailing senators.

The exposure of a questionable rehab facility leads Brenda and her team on a hunt to find a missing crack addict.

The ladies grow tired of Christmas shopping during a heat wave. Later, they volunteer to serve Christmas dinner at a soup kitchen.

Tragedy reunites Claire with an old nemesis; David meets Keith in a disco; Ruth spends a weekend with Hiram.

Jerry accepts his girlfriend's challenge to get angry; George attempts to sell computers with his father; Elaine fends off Lippman and his teenage son.

Kramer frustrates Jerry's quest to find a particularly tasty brand of Chinese gum, and George meets an old pal.

When the CSIs investigate the murder of a rising tennis star, whose fiercest rival was also her best friend, they find that her family history contains some deadly secrets.

When a college student is beaten, shot, and his apartment ransacked, the team attempt to find his killers; Stella's interrogation techniques are called into question.

A physical reveals that Reba has high blood pressure; Van asks for Brock's advice on anniversary gifts.

A troubled former cop meets an unfortunate end, which prompts John Irvin to steer Sipowicz to the source of the tragedy.

A trip to the plastic surgeon's office provides Maura with an exciting glimpse into the future. Josh visits Rita, who is unusually upbeat. Leslie and Ali face a struggle with intimacy and Sarah seeks a distraction from personal problems.

Martin and Clea learn of a shocking development involving Clea's mother, who lives with a mental disability; Teller finds trouble when he visits Jake at the board-and-care facility.

Josh makes a decision after reconnecting with Colton, Ali goes on a mission, Sarah has a hard time controlling her anger, and Maura has an exciting night out.