Scooby-Doo! and the Loch Ness Monster (2004)

Franklin Wendell Welker (born March 12, 1946) is an American voice actor with an extensive career spanning nearly six decades. As of 2021, Welker holds over 860 film, television, and video game credits, making him one of the most prolific voice actors of all time. With a total worldwide box-office gross of $17.4 billion, he is also the third highest-grossing film voice actor of all time.

Kemal Amin "Casey" Kasem (April 27, 1932 – June 15, 2014) was an American disc jockey, radio personality, and voice actor, who created and hosted several radio countdown programs, notably American Top 40. He was the first actor to voice Norville "Shaggy" Rogers in the Scooby-Doo franchise (1969 to 1997 and 2002 to 2009).

Mindy Cohn (born May 20, 1966) is an American television, film and voice actress, who appeared on VH1's List of "100 Greatest Kid Stars". She starred as Natalie Green in the sitcom The Facts of Life from 1979 to 1988, and is known for voicing Velma Dinkley in the Scooby-Doo franchise from 2002 to 2015.