SERIES
MacGyver The new episode “Mac & Jack” uses flashbacks to recall how MacGyver and Jack (Lucas Till, George Eads) first met. 8 p.m. CBS
Crazy Ex-Girlfriend Rebecca (Rachel Bloom) is starting to see a pattern in her life and relationships as the kooky musical comedy presents its midseason premiere. 8 p.m. KTLA
Child Support Host Fred Savage (“The Wonder Years”) quizzes grown-ups, while comic Ricky Gervais puts the same questions to a group of young kids in this new game show. 8 p.m. ABC
Treehouse Masters The builders are back to construct even more outrageous creations in this reality series’ season premiere. 8 p.m. Animal Planet
Hawaii Five-0 McGarrett (Alex O’Loughlin) and the team investigate the killing of an FBI agent in this new episode. 9 p.m. CBS
Marvel’s Agents of S.H.I.E.L.D. Daisy (Chloe Bennet) is in dire straits on a new episode of the action drama directed by costar Clark Gregg. Ming-Na Wen, Elizabeth Henstridge, Iain De Caestecker and Henry Simmons also star. 9 p.m. ABC
Blue Bloods Danny and Baez (Donnie Wahlberg, Marisa Ramirez) probe a reporter’s sudden disappearance, while Frank and Erin (Tom Selleck, Bridget Moynahan) are at odds over drug policy on a new episode of the police drama. 10 p.m. CBS