Suggestions by @flzskpl

Patrick Sabongui

as David Singh in The Flash 3 (2020)

Score: +1

John Wesley Shipp

as Henry Allen in The Flash 3 (2020)

Score: +1

Ray Fisher

as Victor Stone in The Flash 3 (2020)

Score: +1

Shantel VanSanten

as Patty Spivot in The Flash 3 (2020)

Score: +1

Lucas Till

as Malcolm Thawne in The Flash 3 (2020)

Score: +1

Matt Letscher

as Eobard Thawne in The Flash 3 (2020)

Score: +1

Skylar Samuels

as Iris West in The Flash 3 (2020)

Score: +1

Michael C. Hall

as Harrison Wells in The Flash 3 (2020)

Score: +1

Rick Cosnett

as Barry Allen in The Flash 3 (2020)

Score: +1

Rick Cosnett

as Barry Allen (cameo) in The Man of Tomorrow (2019)

Score: +1

Ray Fisher

as Victor Stone (cameo) in The Man of Tomorrow (2019)

Score: +1

Jason Momoa

as Arthur Curry (cameo) in The Man of Tomorrow (2019)

Score: +1

Gal Gadot

as Diana Prince (cameo) in The Man of Tomorrow (2019)

Score: +1

Christian Bale

as Bruce Wayne (cameo) in The Man of Tomorrow (2019)

Score: +1

Alexis Denisof

as DeSaad (cameo) in The Man of Tomorrow (2019)

Score: +1

Ray Porter

as Darkseid (cameo) in The Man of Tomorrow (2019)

Score: +1

Russell Crowe

as Jor-El in The Man of Tomorrow (2019)

Score: +1

Josh Stamberg

as Sebastian Mallory in The Man of Tomorrow (2019)

Score: +1

Imogen Poots

as Cat Grant in The Man of Tomorrow (2019)

Score: +1

Domhnall Gleeson

as Steve Lombard in The Man of Tomorrow (2019)

Score: +1