Halt and Catch Fire (10 p.m., AMC) – Season 2 opens with Cameron and Donna’s fledgling gaming company reaching a critical stage. Also, Joe and Gordon are reunited.
Also on tonight . . .
Marilyn: The Secret Life of Marilyn Monroe (8 p.m., Lifetime) – In the final part of this miniseries, Marilyn cares for her mother while her obsession with President Kennedy drives her over the edge. At 10, “Beyond the Headlines” looks at who might have killed the actress.
Nurse Jackie (9 p.m., Showtime) – Dr. Prince (Tony Shalhoub) enlists Jackie’s help to keep an ICU patient with a brain tumor from giving up his fight to live, and later, Jackie learns some upsetting news about the doctor.
Finding Bigfoot (9 p.m., Animal Planet) – In the 2-hour sixth season premiere, the team searches the Rio Negro at the great Amazon River Basin for a mythical primate with one eye and a large mouth on its stomach.
American Odyssey (10 p.m., NBC) – Luc rescues Odelle and Aslam, and Odelle learns of Luc’s past.