It seems Kara (Melissa Benoist) is going to have to protect National City without the use of her powers in the upcoming seventh episode of Supergirl. Plus, we'll see the debut of Jemm, Son of Saturn: the red-skinned alien who has been both ally and enemy to the Martian Manhunter in the past. He'll be played by Charles Halford, last seen as Chas on NBC's Constantine.
“SUPERGIRL,” MONDAY, DEC. 7 “Human For a Day” – Kara and her friends must rely on their inner strength and courage when an earthquake strikes National City. Also, Alex’s mistrust of Hank reaches a breaking point when the earthquake traps them in the DEO with Jemm (Charles Halford), a powerful alien escapee, on SUPERGIRL, Monday, Dec. 7 (8:00-9:00 PM, ET/PT) on the CBS Television Network.
UPDATE: CBS has also released our first look at Halford as Jemm.