OST stands for "Original Sound Track". So I guess "Scooby OST" would refer to the soundtrack of "Scooby-Doo", the live-action movie.
in the movie scooby doo 1
The Chiller Diller Movie Thriller.
Daphne's age has never been revealed or mentioned in any Scooby-Doo episode, movie, etc.
Well, they did some music for two of the movies, did the theme song for What's New Scooby-Doo, and were in an actual episode of it, so yeah, but they never actually in a Scooby-Doo movie.
I think you might be thinking of "Scooby-Doo", the live-action movie.
The best Scooby-Doo episode is the Harum Scarum Sanitarium
its an episode called the curse of the collar.
Velma became a scientist for NASA according to both "The New Scooby-Doo Mysteries" episode "Happy Birthday, Scooby-Doo" and "Scooby-Doo", the live-action movie of 2002.
The "What's New, Scooby-Doo?" episode "It's All Greek to Scooby-Doo" has a villain who used a centaur disguise. There's a real centaur in "Scooby's Escape from Atlantis" (in "The Richie Rich/Scooby Doo Show", an episode with just Shaggy, Scooby and Scrappy).
The episode is "Jeepers, It's the Jaguaro!" of "The Scooby-Doo Show".
I don't know of an episode where all the gang becomes dogs, but there is an episode where Shaggy and Scooby swap minds ("Who's Scooby-Doo?", part of "The Scooby & Scrappy Doo Puppy Hour."
it is titled Toy Scary Boo, and it is an episode of What's New Scooby Doo.