March 30 (UPI) -- DC and Warner Bros. released a new teaser for Supergirl , featuring an appearance from David Corenswet as Superman. The teaser, released Monday , features a video message left for Supergirl (Milly Alcock), aka Kara Zor-El, from her cousin, Superman. "Hey, it's me, Clark," Superman says. "You know, I'm just worried cause you know -- We miss you. Um, I was just touching base to see when you think you might be coming back." The brief teaser also features Supergirl's dog, Krypto,