Scooby-Doo! and Yin Yang Yo!: Ultimate Woo Foo Mystery is an American animated direct-to-video
action-fantasy comedy film produced by Warner Bros. Animation and distributed by Warner Bros. Home Entertainment. It is the thirty-seventh entry in the direct-to-video series of Scooby-Doo films. The film is a crossover between Scooby-Doo and the 2006 animated Disney series Yin Yang Yo! The story involves Scooby-Doo and the gang teaming up with Level-2 Woo Foo Warriors Yin and Yang and their friends as they take on Carl's newest plot. Scott McCord and Stephanie Morgenstern were the only cast members from Yin Yang Yo! who reprise their roles. The film will premiere at the TCL Chinese Theatre on September 19, 2021 and be released digitally and on DVD September 21, 2021.
In order to solve their newest mystery involving the mythical Crimson Lasher, Scooby-Doo, Shaggy, Fred, Daphne, and Velma must team up with Woo Foo Knights Yin and Yang to defeat Carl, who has struck a deal with the Crimson Lasher to put the town's civilians under mind control!
- Frank Welker as Scooby-Doo and Fred Jones
- Grey Griffin as Daphne Blake
- Matthew Lillard as Shaggy Rogers
- Kate Micucci as Velma Dinkley
- Scott McCord as Yang
- Stephanie Morgenstern as Yin
- Kevin Michael Richardson as Master Yo
- Tom Kenny as Carl the Evil Cockroach Wizard
- Jim Cummings as the Crimson Lasher and Miles
- Rob Paulsen as Roger Jr. and Dave
- Crystal Scales as Lina
- Tara Strong as Mindy
- Greg Cipes as Biff