Hoechlin is set to debut in the first two episodes (at least). Also watch Superman take to the skies in the trailer below.
Supergirl Season 2 "The Adventures Of Supergirl" Synopsis"
THE CW HAS A NEW HERO AND SHE’S BRINGING SUPERMAN WITH HER — When a new threat emerges in National City, Kara/Supergirl (Melissa Benoist) teams up with her cousin, Clark Kent/Superman (guest star Tyler Hoechlin), to stop it. Kara is thrilled to have family in town but it leaves Alex (Chyler Leigh) feeling a bit left out. Meanwhile, Hank (David Harewood) and Supergirl are stunned by the pod that came crashing to Earth. Glen Winter directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Andrew Kreisberg and Jessica Queller.
Supergirl premiers Monday, October 10 at 8/7c on The CW starring Melissa Benoist as Kara Zor-El, Tyler Hoechlin as Superman, Lynda Carter as the president, Chris Wood as Mon-El, Sharon Leal as Miss Martian, Katie McGrath as Lena Luthor, Ian Gomez as Snapper Carr, Floriana Lima as Maggie Sawyer, and Frederick Schmidt as Metallo.