Ghosts | 8:30pm | CBS

Season premiere: While Sam and the ghosts race to find him, Isaac comes face to face with Puritan ghost Patience (Mary Holland) for the first time since she was lost in the dirt.

The Summit | 9:30pm | CBS

As the trekkers struggle with the arduous terrain, the division of alliances among them becomes noticeable. When the Mountain’s Keeper observes the group’s slow pace, she offers a proposition to help them stay on track to reach the summit in time, but not without both individual and collective consequences.

FBI: International | 9pm | CBS

Season premiere: The Fly Team is introduced to Supervisory Special Agent Wesley “Wes” Mitchell (new series regular Jesse Lee Soffer) when his partner is shot in Los Angeles and the suspects flee to Budapest, sending Mitchell overseas.

NCIS | 8pm | CBS

Season premiere: NCIS searches for a missing undercover agent in the midst of an active hostage situation.

Tracker | 8pm | CBS

Season premiere: While investigating the strange disappearance of a missing family whose car was found abandoned on the side of the road in the backwoods of Arkansas, Colter makes a shocking discovery about the mother’s past that leads him into the world of organized crime. Also, Reenie opens up her new law firm and enlists […]

Saturday Night Live | NBC

Host Ariana Grande and musical guest Stevie Nicks.

The Irrational | 8pm | NBC

Repeat: When Rose goes missing, Alec quickly discovers this is no ordinary kidnapping. While Rose plays a dangerous game to stall for time, Alec takes matters into his own hands to find her. 

Law & Order | 8pm | NBC

When the founder of an A.I.-infused dating app is murdered, Shaw and Riley delve into who would want the love-obsessed man dead. Capt. Benson surprises Price and Maroun when she becomes a witness for the defense.

Chicago Med | 8pm | NBC

Hannah treats a woman whose undiagnosed condition threatens the lives of both her and her unborn child. Goodwin receives a chilling message while battling the hospital higher-ups.

Accused | 9pm | Fox

Season premiere: A psychic medium (Huffman) attempts to help a couple desperately looking for their missing son.

9-1-1: Lone Star | 8pm | Fox

The 126 race to contain a toxic chlorine cloud of death unleashed by the train derailment. Owen names the station’s new lieutenant as Judd finds a path forward.

Survivor | 8pm | CBS

Repeat.

Law & Order | 8pm | NBC

Season premiere: When a Brooklyn prosecutor is found slain in her apartment, Maroun takes drastic action to convince an eyewitness to come forward. Riley struggles to adjust to the new lieutenant in charge.

Chicago Med | 8pm | NBC

Dr. Lenox continues to rankle Archer as the two tackle their new roles. Ripley faces possible suspension over what really happened to Pawel, and upstairs, Goodwin is forced to make layoffs.

Murder in a Small Town | 8pm | Fox

While celebrating their high school reunion several former classmates of Cassandra’s discover a dead body at the marina which leads Alberg on an investigation into who the dead resident of Gibsons was and who is responsible for the murder.