Scooby-Doo! and the Monster of Mexico (2003)

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).

Heather North was an American actress best known as the definitive voice of Daphne Blake in the Scooby-Doo franchise for over 30 years. She took over the role from Stefanianna Christopherson in 1970 during the second season of Scooby-Doo, Where Are You! and continued to voice the character across various series and films until 2003.