The Big Bang Theory While Sheldon, Leonard, Penny and Amy (Jim Parsons, Johnny Galecki, Kaley Cuoco, Mayim Bialik) are on a weekend getaway, Sheldon shares a secret about Leonard. 8 p.m. CBS
DC's Legends of Tomorrow To deny Savage (Casper Crump) the help he needs to rule the world, Rip (Arthur Darvill) sends the Legends into the future. 8 p.m. KTLA
Grey's Anatomy Wilmer Valderrama ("That '70s Show") guest stars as a musician who needs treatment for multiple sclerosis in a new episode directed by series costar Chandra Wilson. Ellen Pompeo, Kevin McKidd, Martin Henderson...