Suggestions by @thegoat

Stephen Amell

as Oliver Queen in Arrowverse Earth-0

Grant Gustin

as Barry Allen in Arrowverse Earth-0

Tom Cruise

as Tony Stark in MCU: 838

Lockjaw

as Lockjaw in MCU: 838

Mike Moh

as Triton in MCU: 838

Ken Leung

as Karnax in MCU: 838

Iwan Rheon

as Maximus in MCU: 838

Eme Ikwuakor

as Gorgon in MCU: 838

Serinda Swan

as Medusa in MCU: 838

Isabelle Cornish

as Crystal in MCU: 838

Sendhil Ramamurthy

as Victor Von Doom in MCU: 838

Mckenna Grace

as Valrie Richards in MCU: 838

Jacob Tremblay

as Franklin Richards in MCU: 838

David Krumholtz

as Ben Grimm in MCU: 838

Zac Efron

as Johnny Storm in MCU: 838

Emily Blunt

as Susan Storm in MCU: 838

Ross Marquand

as Ultron Bots in MCU: 838

Rachel McAdams

as Christine Palmer in MCU: 838

Chiwetel Ejiofor

as Carl Mordo/Baron Mordo in MCU: 838

Hayley Atwell

as Peggy Carter in MCU: 838