Jeremy Jordan is set to return to Supergirl after leaving the show in season 3.
Jordan will appear in “Back From the Future, Part One” the January 26 episode set to be directed by David Harewood (J’onn I’onzz), here is the episode description
“As Supergirl tries to thwart a Toyman copycat, Winn Schott returns from the future”
Supergirl resumes Season 5 on Sunday, Jan. 19 with “The Bottle Episode,” in which complications from the Crisis (concluding Tuesday, Jan. 14 on Arrow/Legends) leave Supergirl to face a chaotic threat. Meaghan Rath (Hawaii Five-0), the real-life sister of cast member Jesse Rath, guest-stars.