Special Guest Stars Melissa Benoist as Supergirl / Kara Zor-El / Kara Danvers David Harewood as Hank Henshaw / J'onn J'onzz / Martian Manhunter John Barrowman as Cutter Moran Jeremy Jordan as Grady Chris Wood as Mon-El Chris Wood as Tommy Moran Victor Garber as Digsy Foss' Husband Guest Stars Michelle Harrison as Nora Allen Darren Criss as Music Meister Co Starring Liam Hughes as Young Barry Allen Braden Chase as Goon #1 Gili Roskies as Patron Uncredited Candice Patton as Millie Foss Jesse L. Martin as Digsy Foss Carlos Valdés as Pablo
