I cannot leave the topic of Scooby-Doo without mentioning Frank Welker.
Frank was the voice of Fred in the first season of Scooby-Doo and has been doing it (with only a few small exceptions) ever since!
And he has been doing the voice of Scooby since 2002 as well.
Fantastic achievement.
But that's not all. Frank has been involved in an unbelievable number of movies, TV shows, etc. Here is a full list of his work.
But most amazingly of all, he has been named at number 1 on the "All Time Top 100 Stars at the Box Office"! He beat Samuel L. Jackson into second place and Tom Hanks into third!