Suggestions by @noahharris

James Spader

as Eobard Thawne (Voice/Flashback) in DC Cinematic Multiverse

Christina Hendricks

as Shiera Sanders Hall in The Flash: Flash of Two Worlds

Vin Diesel

as Carter Hall in The Flash: Flash of Two Worlds

Daniel Craig

as Allan Scott in The Flash: Flash of Two Worlds

Noah Schnapp

as Wally West in The Flash: Flash of Two Worlds

J.K. Simmons

as Jay Garrick in The Flash: Flash of Two Worlds

Jake Gyllenhaal

as Leonard Snart in The Flash: Flash of Two Worlds

Rami Malek

as Lex Luthor in The Flash: Flash of Two Worlds

Bruce Willis

as Henry Allen in The Flash: Flash of Two Worlds

James Spader

as Eobard Thawne (Voice/Flashback) in The Flash: Flash of Two Worlds

Emma Watson

as Iris West in The Flash: Flash of Two Worlds

Zac Efron

as Barry Allen/Eobard Thawne in The Flash: Flash of Two Worlds

Mike Colter

as David Hyde in DC Cinematic Multiverse

Mike Colter

as David Hyde in Aquaman: Black Manta Rising

Chiwetel Ejiofor

as J'onn J'onzz in Aquaman: Black Manta Rising

Becky G

as Jessica Cruz in Aquaman: Black Manta Rising

Zack Snyder

as Barry Allen in Aquaman: Black Manta Rising

Dacre Montgomery

as Kal-El/Clark Kent in Aquaman: Black Manta Rising

Nicholas Hoult

as Bruce Wayne in Aquaman: Black Manta Rising

Naomi Scott

as Princess Diana in Aquaman: Black Manta Rising