Spoilers ahead for the Season 3 finale of Supergirl.
The third season of Supergirl only just came to an end, but the finale changed the game in some big enough ways that it's already worth looking ahead to Season 4. The finale ended with Winn and most of the Legion of Super-Heroes off to the future, Brainiac 5 as Winn 2.0 at the D.E.O., James outed as Guardian, J'onn retiring from the D.E.O., Alex taking over his old job, Alura returning to Argo City, and a Kara doppelganger landing in Siberia to kick off Supergirl's version of the Red Son story from DC Comics lore. Now, while the loss of Winn as a regular means that he won't be around as much in Season 4, he will be back. The future isn't quite so certain for other characters. So, read on for our picks of 7 Supergirl characters that need to come back next season!
President Olivia Marsdin
Olivia Marsdin made her Supergirl debut back in the beginning of Season 2 as the President of the United States. She arrived in National City to sign a decree that would grant the rights of U.S. citizens to aliens, which understandably endeared her to Kara. The end of her first episode revealed that President Marsdin is actually an alien herself. She popped up a couple of more times in Season 2 but was absent from Season 3. Episodes with Olivia Marsdin in the mix are always fun. Throw in the fact that she's played by none other than TV Wonder Woman Lynda Carter, and she needs to come back.
Supergirl is obviously the story of the Girl of Steel rather than her more famous cousin, but the show has proven that it can handle including the Man of Steel in episodes without overshadowing Kara. Tyler Hoechlin can tackle both the charming clutziness of Clark Kent and the dashing superhero Superman. He's a fun Superman that can't necessarily be found in other superhero projects, and the team-ups between Clark and Kara are always entertaining. Now that Supergirl proved Superman can appear without taking all the spotlight, Supergirl should totally bring him back. Although we don't need 23 episodes of Superman per season, there's room for him to drop in from time to time.