Dr. Bull (Michael Weatherly) will be taking a case wherein he tries to pin a cult for a murder. Meanwhile, a new cast member joins in season 1 that might become a series regular in the next season.

On the next episode of "Bull" season 1, titled "Make Me," Dr. Bull will be handling a difficult case where he has to prove that the suspect was in a daze at the time of the murder.

"Bull aims to prove temporary insanity at a murder trial for his client, Troy Dickerson (Brendan Dooling), a young man he believes was brainwashed by a cult-like spiritual learning center to kill his father. Also, Danny (Jaime Lee Kirchner) and Chunk (Christopher Jackson) go undercover at the learning center to find the perpetrator responsible for their client's reprogramming," the episode listing on The Futon Critic reads.

As seen from the episode 20 photos from BuddyTV, Dr. Bull will need more of Danny and Chunk's participation in the case as he will need them to pretend to be clients of the learning center that might have caused their client to become a murderer.

Chunk will be the one to receive the facility's treatments, and from the look on his face, it appears that he is far from enjoying his experience.

Meanwhile, a new cast member joins "Bull" season 1, and she might be brought over to the new season as a series regular.

Deadline reports that Eliza Dushku will be appearing on "Bull" season 1 episode 21, "Welcome Back, Dr. Bull."

On the May 9 episode of "Bull," Dushku will be introduced as the head of the top criminal defense firm in the Big Apple known as J.P. Nunnelly. She will be hired by Bull as a replacement for one of the members of his team that will go to prison.

"Bull" season 1 airs every Tuesday night at 9 p.m. EDT on CBS.