Suggestions by @duel79

Spoiler

as "The Conqueror" in The Infinity Gauntlet

Colin Firth

as Grandmaster in The Infinity Gauntlet

Will Yun Lee

as Collector in The Infinity Gauntlet

Charles Parnell

as Runner in The Infinity Gauntlet

John Leguizamo

as Gardener in The Infinity Gauntlet

Yuri Kolokolnikov

as Champion of the Universe in The Infinity Gauntlet

Finn Wittrock

as In-Betweener in The Infinity Gauntlet

George Newbern

as Eternity in The Infinity Gauntlet

Terrence 'T.C.' Carson

as Living Tribunal in The Infinity Gauntlet

Liam Neeson

as Galactus in The Infinity Gauntlet

CGI Monster

as Lockjaw in The Infinity Gauntlet

Bradley Constant

as Gorgon in The Infinity Gauntlet

Abigail Cowen

as Crystal in The Infinity Gauntlet

Dallas Liu

as Karnak in The Infinity Gauntlet

Jimmy Liu

as Triton in The Infinity Gauntlet

Angourie Rice

as Medusa in The Infinity Gauntlet

Jack Champion

as Black Bolt in The Infinity Gauntlet

Chris Sullivan

as Volstagg in The Infinity Gauntlet

Billy Magnussen

as Fandral in The Infinity Gauntlet

Travis Fimmel

as Heimdall in The Infinity Gauntlet