- Victor Garber
- Narrator
- Greg Berlanti
- Self - Executive Producer: Arrow, The Flash, DC's Legends of Tomorrow
- Marc Guggenheim
- Self - Executive Producer: Arrow, DC's Legends of Tomorrow
- Phil Klemmer
- Self - Executive Producer: DC's Legends of Tomorrow
- Andrew Kreisberg
- Self - Executive Producer: Arrow, The Flash, DC's Legends of Tomorrow
- Wendy Mericle
- Self - Executive Producer: Arrow
- Casper Crump
- Vandal Savage
- Arthur Darvill
- Rip Hunter
- Franz Drameh
- Jefferson Jackson
- Falk Hentschel
- Carter Hall / Hawkman (archive footage)
- Dean Jagger
- Collins
- Matt Letscher
- Eobard Thawne / Reverse-Flash (archive footage)
- Jesse L. Martin
- Joe West
- David Ramsey
- John Diggle
- Ciara Renée
- Kendra Saunders / Hawkgirl (archive footage)
- Abiola Uthman
- Security Guard
- Carlos Valdes
- Cisco Ramon
- Natasha Vasiluk
- Baba Yaga
- Lucia Walters
- President Susan Brayden
- Andrew Beha
- Guard
- Michael Jonsson
- Soldier
