Thread:Fishbird/@comment-4327179-20140402193208/@comment-4327179-20140828013042

It features the return of the Phantom Virus from Scooby-Doo and the Cyber Chase

Velma guest stars in this episode for the science fair

It is also a crossover with Pokemon

And here is the plot

Scooby-Doo and the gang have been accidentally teleported - and end up trapped - in their favorite video game, Pokémon. They encounter Ash Ketchum and friends, battling with his archenemies, the Team Rocket, and must find a way to get back home.

It takes place during the first generation of Pokemon