Suggestions by @jurassictransformers

Spoiler

as "From The Future" in James Gunn's Ben 10 (Season 1)

Benedict Cumberbatch

as Professor Paradox in James Gunn's Ben 10 (Season 1)

Sofia Boutella

as Frightwig in James Gunn's Ben 10 (Season 1)

Doug Jones

as Acid Breath in James Gunn's Ben 10 (Season 1)

Kevin Durand

as Thumbskull in James Gunn's Ben 10 (Season 1)

Bill Skarsgård

as Zombozo in James Gunn's Ben 10 (Season 1)

Dan Stevens

as Fistrick in James Gunn's Ben 10 (Season 1)

Joe Manganiello

as Kyber The Huntsman in James Gunn's Ben 10 (Season 1)

Peter Dinklage

as Dr. Psychobos in James Gunn's Ben 10 (Season 1)

Wagner Moura

as Malware in James Gunn's Ben 10 (Season 1)

Matt Smith

as Psyphon in James Gunn's Ben 10 (Season 1)

Tony Todd

as Vilgax in James Gunn's Ben 10 (Season 1)

Ariana Greenblatt

as Young Kai in James Gunn's Ben 10 (Season 1)

Isabella Sermon

as Young Gwen in James Gunn's Ben 10 (Season 1)

Walker Scobell

as Young Ben in James Gunn's Ben 10 (Season 1)

Emma Roberts

as Sandra Tenyson in James Gunn's Ben 10 (Season 1)

Paul Rudd

as Carl Tennyson in James Gunn's Ben 10 (Season 1)

Harrison Ford

as Wes Green in James Gunn's Ben 10 (Season 1)

Mark Hamill

as Max Tennyson in James Gunn's Ben 10 (Season 1)

Grant Gustin

as Rook Blonko in James Gunn's Ben 10 (Season 1)