Suggestions by @robertwaynecarroll

Zachary Levi and Asher Angel

as Shazam (Billy Batson) (Opening Scene Cameo) in The Flash

Christian Bale

as BATMAN (Bruce Wayne) (Cameo) (Nolanverse) in The Flash

Ryan Reynolds

as Green Lantern Hal Jordan (Cameo) (Campbellverse) in The Flash

Margot Robbie

as Yo-Yo (Harleen Quinzel) (Flashpoint Earth) in The Flash

Grace Caroline Currey

as Black Mary (Mary Bromfield) (Flashpoint Earth) in The Flash

Michael Shannon

as General Zod (Dru-Zod) (Flashpoint Earth) in The Flash

Desmond Chiam

as King Jerrod (Cameo (Flashback) in Mortal Kombat

Sophia Xu

as Kitana (Flashback) in Mortal Kombat

Tenoch Huerta Mejía

as Namor (Ch'ah Toh Almehen) in The 1980s AVENGERS

Seth Carr

as Erik Killmonger (Cameo) in The 1980s AVENGERS

Cate Blanchett

as Hela in The 1980s AVENGERS

Chris Hemsworth

as Thor Odinson in The 1980s AVENGERS

Djimon Hounsou

as Korath the Pursuer in The 1980s AVENGERS

Leonard Roberts

as Nam-Ek (Flashpoint Earth) in The Flash

Tom Holland

as The Flash (Wally West) (End Of Movie Cameo) in The Flash

Chris Hemsworth

as Aquaman (Arthur Curry) (End Of Movie Cameo) in The Flash

Gal Gadot

as Wonder Woman (Diana Prince) (Opening Scene) in The Flash

Jason Momoa

as Aquaman (Arthur Curry) (Opening Scene) in The Flash

David Corenswet

as Superman (Clark Kent) (Kal-El) (End Of Movie Cameo) in The Flash

Henry Cavill

as Superman (Clark Kent) (Kal-El) (Opening Scene) in The Flash