Twenty Thousand Screams Under the Sea

Cast

• 

  Don Messick

  Scooby-Doo (voice)

• 

  Lennie Weinrib

  Scrappy-Doo (voice)

• 

  Casey Kasem

  Shaggy Rogers (voice)

• 

  Frank Welker

  Fred Jones (voice)

• 

  Heather North

  Daphne Blake (voice)

• 

  Patricia Stevens

  Velma Dinkley (voice)

• 

  John Stephenson

  Miguel Valdez

• 

  Pat Fraley

  Tiger Morris