Lethal Weapon / 8:00pm (5) Guest star Thomas Lennon (“Reno 911!”) is back as Leo Getz in the new episode “Leo Getz Hitched,” which largely describes what happens in the story. However, the wedding leads Riggs and Murtaugh (Clayne Crawford, Damon Wayans Sr.) into the search for a missing person. Riggs also has an unexpected reunion, and Murtaugh gets news that could shake up his entire life. Kristen Gutoskie continues her guest role as Molly.
Roseanne / 8:00pm (7) Johnny Galecki has been busy elsewhere lately — with “The Big Bang Theory,” of course — but he returns to this series in the new episode “Darlene v. David,” as his character arrives to help celebrate Harris’ (Emma Kenney) birthday. His presence prompts Darlene (Sara Gilbert) to take a hard look at her life as it is now. Displaced from her nursing home, Bev (guest star Estelle Parsons) becomes a houseguest of the Conners. Roseanne Barr, John Goodman and Laurie Metcalf also star.
Shadowhunters / 8:00pm (Freeform) A determined Jace (Dominic Sherwood) goes on a hunt to find out who is targeting Simon (Alberto Rosende), while Clary (Katherine McNamara) tries to do her part by asking Luke (Isaiah Mustafa) for his assistance in the new episode “Stronger Than Heaven.” Meanwhile, Alec (Matthew Daddario) starts to fret about the future of his relationship with Magnus (Harry Shum Jr.) after he learns more about his lover’s eventful romantic past. Anna Hopkins, Chai Hansen and Lisa Berry guest star.
Bull / 9:00pm (13) Bull (Michael Weatherly) is reunited with a friend who wants him to help with the case of a domestic-abuse survivor in the new episode “Justified.” The woman killed her husband as he slept, but allegedly because his behavior threatened both her and her unborn child. Freddy Rodriguez, Geneva Carr, Christopher Jackson, Jaime Lee Kirchner and Annabelle Attanasio also star.
Clayne Crawford stars in “Lethal Weapon” Tuesday on Fox.