Suggestions by @vadim_havard

Neil Jackson

as Icicle in Flash

Darren Criss

as Music Meister in Flash

Peyton List

as Poison Ivy in Flash

Lane Davies

as Tempus in Flash

Isabela Merced

as Hawkgirl in Flash

Harry Lennix

as Martian Manhunter in Flash

Kayla Compton

as Allegra Garcia in Flash

Piper Curda

as Avery Ho in Flash

Stephen Amell

as Green Arrow in Flash

Jeremy Davies

as Doctor Destiny in Flash

Tom Cavanagh

as Reverse Flash in Flash

Rick Dietrich

as Joar Mahkent in Flash

Joel McHale

as Ultra-Humanite in Flash

Noah Centineo

as Atom Smasher in Flash

Jai Courtney

as Captain Boomerang in Flash

David Sobolov

as Gorilla Grodd in Flash

Ezra Miller

as Bizarro Flash in Flash

Melissa Benoist

as Overgirl in Flash

Ben Affleck

as Batman in Flash

Javicia Leslie

as Red Death in Flash