Kara's famous cousin hasn't appeared on Supergirl since the end of Season 2 - although he's been name-dropped plenty - but the Man of Steel (Tyler Hoechlin) will be back in action this time around, as Kara pays him to visit with various Earths in danger. Interestingly, he'll be living at the same farm used in Smallville, opening the door for that show to be brought into the Arrowverse.