DC and Warners continue developing a live-action "Supergirl" feature written by Oren Uziel ("Cloverfield Paradox") that could include 'Comet' the 'Superhorse', 'Krypto' the 'Superdog' and 'Streaky' the 'Supercat':
'Supergirl' aka 'Kara Zor-El', debuted in DC's "Action Comics" #252 (May 1959), created by writer Otto Binder and illustrator Al Plastino...
....as the cousin of 'Superman', sharing his super powers and vulnerability to 'Kryptonite'.
"...she is the last survivor of 'Argo City', which had survived the explosion of the planet 'Krypton' and drifted through space.
"During the roughly thirty years Argo City traveled through space, Zor-El met and married 'Alura', daughter of 'In-Ze', who in turn bore their daughter, 'Kara' and the adolescent Kara was sent to Earth by Zor-El in a rocket, to be raised by her cousin 'Kal-El'.
"On Earth, Kara acquires powers identical to Superman's and adopts the secret identity of 'Linda Lee', a resident of 'Midvale Orphanage'.
"She conceals her blonde hair beneath a brunette wig and functions as 'Supergirl' only in secret, at Superman's request...
"...until she can gain, in his opinion, sufficient control of her powers...
"... and the wisdom to properly use them.
"After she is adopted by 'Fred' and 'Edna Danvers', Superman decides his cousin is ready to begin operating openly as Supergirl..."