“Human For a Day” — Alex’s (Chyler Leigh, pictured) 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. Photo: Darren Michaels/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.