Supergirl is joined by familiar faces from the past to help her stop Lex and Nyxly for good. Meanwhile, Alex and Kelly prepare to walk down the aisle.

Arran Henn, Brenda Strong, Calista Flockhart, Chris Wood, Crystal Balint, Helen Slater, Jeremy Jordan, Jhaleil Swaby, Jon Cryer, Julian Kato, Keith Dallas, Matt Baram, Mehcad Brooks, Mila Jones, Sonia Sunger