Scooby-Doo! and the Samurai Sword is the thirteenth of a series of direct-to-video animated films based upon the Scooby-Doo Saturday morning cartoons. It, along with The Goblin King, was produced and completed in 2008, but Goblin King was released first for the Halloween season. It was released on April 7, 2009, and it was produced by Warner Bros. Animation, though it featured a logo for and copyright to Hanna-Barbera at the end (this was the last time the logo was shown). It features the Mystery, Inc. gang traveling to Japan and is the final Scooby-Doo film to have Casey Kasem as the voice of Shaggy, as he retired a few months after the film was released. In the USA, the DVD sold 163,890 units in its first week and as of March 2012, it has sold approximately 508,000 units.
At a Tokyo museum of ancient history, Mr. Takagawa, the curator, and Kenji, a janitor, witness the resurrection of The Black Samurai, an ancient Japanese warrior whose armor was to be the newest exhibit at the museum. The next day, the Mystery Inc. gang arrives at Tokyo, where Daphne is to participate in a martial arts tournament at a prestigious school. The gang meet Daphne’s friend Miyumi, who explains the difficulty of winning the tournament and entering the school as a student. The gang and Miyumi take a fully functioning robotic plane to the school, which is run by Miss Mirimoto. After Daphne defeats Miss Mirimoto’s bodyguard, Sojo, and almost defeats Miyumi, Mirimoto tells her she shows promise as a fighter. Also at the tournament is Mr. Takagawa, who explains to Mirimoto that the Black Samurai has risen and will be after the Destiny Scroll, which is at the school. That night, during a feast, the Black Samurai and his Ninja warriors attack the school and steal the scroll. But Mirimoto explains the scroll was only a copy, and shows the gang the real one. Mr. Takagawa explains to the gang the legend of the Black Samurai.
The Black Samurai was an ancient warrior who asked the great swordsmith Masamune to craft a powerful sword. The sword maker agreed, but told the Samurai it would take a year to make. Masamune’s evil apprentice Muramasa offered to make another sword for the Samurai in only half the time, which the Samurai accepted. But when the Samurai took the sword, the evil of Muramasa was transferred to him, and he became the Black Samurai, wielding the Sword of Doom. When Masamune finished crafting his sword, the Sword of Fate, he presented it to The Green Dragon, who used it to defeat the Black Samurai and imprisoned him in the Sword of Doom. The Dragon then hid the sword, and put its whereabouts in a riddle on the Destiny Scroll.
Velma is able to solve the riddle, and Miss Mirimoto instructs the gang, Miyumi, and Mr. Takagawa to find the Sword of Doom before the spirit can. The gang finds the sword in a cave on an island in the Pacific Ocean, where they are attacked by the Black Samurai. During the fight the Black Samurai is revealed to be Sojo. But once the gang brings Sojo back to Miss Mirimoto, she and Miyumi capture them. Miss Mirimoto explains that she staged the tournament to bring the Mystery Inc to Japan so that they would find the Sword of Doom for her. She also reveals she plans to release the Black Samurai so she can use him to return Japan to the way it was in feudal times. The ninja army is revealed to be robots in which Miss Mirimoto planted the various fighting techniques of her students (including Daphne's). She then locks Fred, Daphne, Velma, and Mr. Takagawa in the museum, but not before Daphne kicks the Samurai's sword from Miss Mirimoto's hand into Scooby and Shaggy's possession.
Scooby and Shaggy manage to escape Miss Mirimoto with the samurai sword, but are chased by the ninja warriors. They are saved by Matsuhiro, a sushi shop owner and Samurai, who trains them as Samurai and who also is aware of the legend. Matsuhiro instructs Scooby and Shaggy to pass through the gates of earth, air, fire, and water in order to find the Green Dragon and the Sword of Fate. When they do so, the Green Dragon enters the sword and takes them back to the museum to combat the Black Samurai. Kenji frees Fred, Daphne, Velma, and Mr. Takagawa, and they, plus Miyumi, who decides to fight with them, attempt to stop Sojo and Miss Mirimoto from resurrecting the Black Samurai, but failed. After reviving the Samurai, Miss Mirimoto tries to make him her servant, but she is quickly entrapped and rendered unconscious. Scooby and Shaggy arrive riding the Green Dragon and, along with a little encouragement from Matsuhiro, defeat the Black Samurai by using the Sword of Fate to destroy the Sword of Doom, breaking the curse on the Samurai, who finally passes on to the afterlife. Later, the gang attends the newly renovated museum, where a statue of Scooby is erected in his honor.
- Miss Mirimoto
- The Black Samurai
- This is Casey Kasem's last time voicing Shaggy for a Scooby-Doo direct-to-DVD film since his retirement in 2009 from radio and voice acting. However, on European releases, Shaggy Rogers was voiced by Scott Innes, who also provides the voice of Shaggy on Scooby-Doo and the Witch's Ghost, Scooby-Doo and the Alien Invaders and Scooby-Doo and the Cyber Chase.
- This is the final Scooby-Doo production animated in the same style as What's New, Scooby-Doo?
- Daphne's Martial Art skills are finally displayed (similar to the first two live action Movies), many critics said, "Scooby-Doo, and a mixture of Naruto."
- This is probably the first time in which Shaggy and Scooby dare to use a REAL weapon to fight off a villain.
- Miss Mirimoto's swords are based on Renji Abarai's sword, Zabimaru from the Bleach anime & manga.
- The Japanese swordsmiths Gorō Nyūdō Masamune & Muramasa Sengo are referenced in the legend of the black Samurai.
- In the shots of Tokyo, a billboard of Utada Hikaru's album Ultra Blue is shown.
- As well as a billboard of Utada Hikaru appearing one of her song's from Ultra Blue is also played during a chase scene, the song is the ending of her song entitled Wings
- Frank Welker as Scooby-Doo, Fred Jones, Kerry Kilpatrick and Mad Dog Masimoto
- Casey Kasem as Shaggy Rogers
- Mindy Cohn as Velma Dinkley
- Grey DeLisle as Daphne Blake
- Kelly Hu as Miyumi/Miss Mirimoto
- Sab Shimono as Mr. Takagawa
- Keone Young as Matsuhiro
- Kevin Michael Richardson as Sojo/The Black Samurai
- Gedde Watanabe as Kenji
- George Takei as Old Man Samurai
- Brian Cox as The Green Dragon
Scooby-Doo! Abracadabra-Doo, the 14th Scooby-Doo direct-to-video animated movie, was released in the US on February 16, 2010.