Scoob!

"Jason Isaacs — Dick Dastardly"

"Kiersey Clemons — Dee Dee Skyes"

"Ken Jeong — Dynomutt"

"Tracy Morgan — Captain Caveman"

"Simon Cowell — Himself (disguise)"

"Christina Hendricks — Officer Jaffe (disguise)"

"Henry Winkler — Keith"

"Harry Perry — Himself"

"John DiMaggio — Restaurant Owner"

"Kevin Heffernan — Bike Cop Gary"

"Ira Glass — Himself"

"[to Simon Cowell] No fries for you."

"Maya Erskine — Judy Takamoto"

"Billy West Don Messick — Muttley"

"Fred Tatasciore — Cerberus"

"Justina Machado — Jamie Rivera"

"Kennedy Peil — Indira Knight"

"John McDaniel — Hal Murphy"

"Ryan Folsey — Beach Guy"

"Pam Coats — Mrs. Rogers"

"— Ghost / Mr. Rigby, Alice"

"Henry Kaufman — Chad and Chet"

"FYI, you are officially out of... everything."

"We'll walked home."

"No thanks, Dastardly."

"Rokay Rick"

"Rick with a D."