Supergirl This new episode helps set up next week's crossover with "The Flash," as Siobhan Smythe (Italia Ricci) schemes against Kara (Melissa Benoist). 8 p.m. CBS
Crazy Ex-Girlfriend Rebecca (Rachel Bloom) and her therapist (Michael Hyatt) are stuck on a plane together during a mysterious journey. Amber Riley and Ricki Lake guest star. 8 p.m. KTLA
Dancing With the Stars Jodie Sweetin, Geraldo Rivera, Ginger Zee, Kim Fields, Doug Flutie and Von Miller are among this season's batch of celebrity contestants. 8 p.m. ABC
Gotham Penguin (Robin Lord Taylor)...