Suggestions by @vadim_havard

Kristen Wiig

as Cheetah in Flash

Sylvester Stallone

as King Shark in Flash

Daniel Cudmore

as Gridlock in Flash

Mark Sweatman

as Hunk Norvock in Flash

Wentworth Miller

as Captain Cold in Flash

Nicholas Hoult

as Lex Luthor in Flash

Jimmy Jean-Louis

as Amazo in Flash

Ronnie Zappa

as Doctor Psycho in Flash

David F. Sandberg

as Mister Mind in Flash

Carlos Valdes

as Vibe in Flash

Sendhil Ramamurthy

as Bloodwork in Flash

Alan Tudyk

as Doctor Phosphorus in Flash

David Dastmalchian

as Abra Kadabra in Flash

Joe Morton

as Silas Stone in Flash

Keiynan Lonsdale

as Wallace West in Flash

Clancy Brown

as Wade Eiling in Flash

Tom Felton

as Doctor Alchemy in Flash

Jurnee Smollett

as Black Canary in Flash

Joy Osmanski

as Tigress in Flash

Kyle Chandler

as Green Lantern in Flash