The Big Bang Theory Leonard’s (Johnny Galecki) recently divorced parents (Christine Baranski, Judd Hirsch) visit, as does Sheldon’s (Jim Parsons) devoutly religious mother (Laurie Metcalf). Kaley Cuoco and Simon Helberg also star in the season finale. 8 p.m. CBS
DC's Legends of Tomorrow Rip and Rory (Arthur Darvill, Dominic Purcell) don't like being near the Time Masters, and Snart (Wentworth Miller) is shown to be firmly on the side of the good guys. 8 p.m. KTLA
Grey's Anatomy Amelia and Owen (Caterina Scorsone, Kevin McKidd) move their romance forward while...