Suggestions by @xylopiano

Amy Sedaris

as Happy Cat in Silly Cats

Cary Elwes

as Edward in Silly Cats

Danny DeVito

as Uncle in Silly Cats

Bob Persichetti

as Ohmygos in Silly Cats

Samuel L. Jackson

as Herbert in Silly Cats

Ludacris

as Herbert in Silly Cats

Dua Lipa

as Chipi Chipi Chapa Chapa Cat in Silly Cats

Tim Curry

as Evil Cat in Silly Cats

Kelly Marie Tran

as Future Kitty in Silly Cats

Jack Black

as Roobeer in Silly Cats

"Weird Al" Yankovic

as Quetzkol The Incomprehensible Deity in Silly Cats

Samuel Ramey

as Unknown in Silly Cats

Ken Jeong

as Bingus in Silly Cats

Shameik Moore

as Cuh in Silly Cats

Sam Elliott

as Floppa in Silly Cats

Shannon Chan-Kent

as Nyan Cat in Silly Cats

Mark Fischbach

as Gamer Kitten in Silly Cats

Danny Trejo

as El Gato in Silly Cats

Sr Pelo

as Thurston Waffles in Silly Cats

Nick Offerman

as Dr Pebba in Silly Cats