Suggestions by @thepopsorcerer

Michael Cera

as Gurgle in Finding Nemo

Eric Idle

as Chum in Finding Nemo

Benedict Cumberbatch

as Anchor in Finding Nemo

Wayne Knight

as Red in Cars

Beyoncé

as Flo in Cars

Michelle Pfeiffer

as Lizzie in Cars

Florence Pugh

as Holley Shiftwell in Cars

Benedict Cumberbatch

as Finn McMissile in Cars

Hailee Steinfeld

as Princess Daisy in Super Mario Bros. (Live-action)

Josh Brolin

as Bowser in Super Mario Bros. (Live-action)

Jim Carrey

as Waluigi in Super Mario Bros. (Live-action)

Ian McShane

as Wario in Super Mario Bros. (Live-action)

Zachary Levi

as Mario in Super Mario Bros. (Live-action)

Adam Driver

as Luigi in Super Mario Bros. (Live-action)

Rami Malek

as Yev Kassem in Seinfeld Reboot

Seth Rogen

as Newman in Seinfeld Reboot

Ben Schwartz

as Cosmo Kramer in Seinfeld Reboot

Jerry Trainor

as Jerry Seinfeld in Seinfeld Reboot