The Truth. “The Cast (Clockwise from top center): Daria Morgendorffer (Daria), Susan and Mary Test (Johnny Test), Velma Dinkley (Scooby Doo), Dexter (Dexter’s L The Truth “The Cast (Clockwise from top center): Daria Morgendorffer (Daria) Susan and Mary Test (Johnny Test) Velma Dinkley (Scooby Doo) Dexter (Dexter’s L