Suggestions by @joker10

Henry Thomas

as Doctor Mid-Nite in Crisis on Infinite Earths

Lou Ferrigno Jr.

as Hourman in Crisis on Infinite Earths

Ben Diskin

as Beebo in Crisis on Infinite Earths

Kelly Frye

as Bette Sans Souci in The Flash

Clancy Brown

as General Wade Elling in The Flash

Emily Bett Rickards

as Felicity Smoak in The Flash

Wentworth Miller

as Leonard Snart in The Flash

Anthony Carrigan

as Kyle Nimbus in The Flash

Robbie Amell

as Ronnie Raymonds in The Flash

William Sadler

as Simon Stagg in The Flash

Michael Christopher Smith

as Danton Black in The Flash

Stephen Amell

as Oliver Queen in The Flash

John Wesley Shipp

as Henry Allen in The Flash

Al Sapienza

as Det. Fred Shyre in The Flash

Patrick Sabongui

as Captain David Singh in The Flash

Chad Rook

as Clyde Mardon in The Flash

Michelle Harrison

as Nora Allen in The Flash

Jesse L. Martin

as Joe West in The Flash

Tom Cavanagh

as Dr. Harrison Wells in The Flash

Carlos Valdes

as Cisco Ramon in The Flash