Suggestions by @DarkNexus

Phil Lord and Christopher Miller

as Director in Booster Gold

Hayden Christensen

as Hal Jordan in Booster Gold

David Corenswet

as Superman in Booster Gold

Zoey Deutch

as Michelle Carter in Booster Gold

J.K. Simmons

as Sam Carter in Booster Gold

Wes Bentley

as Maxwell Lord in Booster Gold

Iwan Rheon

as Black Beetle in Booster Gold

James McAvoy

as Dr. Will Magnus in Booster Gold

Scott Eastwood

as Rip Hunter in Booster Gold

Jason Sudeikis

as Ted Kord in Booster Gold

Halston Sage

as Trixie Collins in Booster Gold

Alan Tudyk

as Skeets in Booster Gold

Glen Powell

as Booster Gold in Booster Gold

Shailene Woodley

as Iris West in The FLASH: Rogues

Drew Goddard

as Writer in The FLASH: Rogues

Edgar Wright

as Director in The FLASH: Rogues

Hayden Christensen

as Something Called Brainiac" in The FLASH: Rogues

Spoiler

as Something Called Brainiac" in The FLASH: Rogues

Brandon Sklenar

as Batman in The FLASH: Rogues

David Corenswet

as Superman in The FLASH: Rogues