Teen Titans: Trouble in Tokyo is a 2006 American made-for-TV animated superhero film adaptation of the DC Comics superhero team Teen Titans. It is set in the milieu of the animated series Teen Titans that ran on Cartoon Network from 2003 to 2006, with the film serving as the series finale. It premiered on Cartoon Network, Friday, September 15, 2006. Teen Titans head writer David Slack wrote the film.

A high-tech ninja called Saico-Tek who is clad in pink and blue goes on a spree of destruction in Jump City with color coordinated glaives that explode. The Teen Titans intervene but he is always one step ahead of them with his arsenal of weapons, martial arts skills and an ability to regenerate limbs. When he launches an attack on Titans Tower, Robin dives from the roof and captures him by taking his jetpack. However, the tower is in near ruins from his glaives. Robin attempts to interrogate him, but he only speaks Japanese which Robin does not understand.

Robin uses a translation program to understand what Saico-Tek is saying. Saico-Tek expresses fear of failing his master, Brushogun, who is based in Japan. He then triggers a fire sprinkler, causing him to dissolve into black goo. Subsequently the Titans head to Tokyo, Japan to search for Brushogun.

Beast Boy is excited to be in Japan because he is in need of a vacation. He wants to tour a manga publishing company called "Wakamono Shuppan" while they are in Tokyo, but Robin reminds the team that they are in Japan in order to apprehend Brushogun. Unbeknownst to them, a shadowy figure who is seemingly Brushogun is using computer monitors in order to spy on them. Robin decides to start investigating in Shinjuku, but his inability to speak Japanese makes it impossible for him to know how to go to Shinjuku. Starfire kisses a random teenage Japanese boy in order to learn Japanese, much to Robin’s horror.

When a green kaiju-scale reptilian monster named Deka-Mido attacks Tokyo, the team attempts to fight it, but it has the same regenerative power as Saico-Tek and they hardly slow it down. A defense force called the Tokyo Troopers uses an energy cage to stop the creature. Their commander, Uehara Daizo, shows the Titans around the Troopers’ headquarters. When Robin requests to use the Troopers’ equipment in order to find Brushogun, Daizo reveals that Brushogun is an urban legend. He reminds the Titans that they are welcome to enjoy Tokyo, but only if they refrain from superheroics.

Beast Boy decides to tour Wakamono Shuppan but it is closed. The Titans split off on their own unique side plots: Cyborg eats at a sushi restaurant. His appetite that is under an “all-you-can-eat” offer angers the owner who decides to make it a challenge. Beast Boy falls in love with a teenage Japanese girl while he sits on the steps of Wakamono Shuppan. She leads him to a karaoke bar where he wins the hearts of girls by singing. Raven searches for something to read out of boredom. Robin and Starfire watch a sumo match, go on a rowboat ride and play games at an arcade before going to Tokyo Tower.

They express their feelings for each other until Robin becomes distracted by a new clue to Brushogun's location, causing Starfire to fly away out of sadness. The shadowy figure sends a new version of Saico-Tek, who is now clad in all pink, to eliminate him.

They get into a violent duel where Robin barely manages to hold his ground against Saico-Tek. When he pummels Saico-Tek into the ground, the ninja is seemingly killed by the force of his blows. He notices pink stains that are on his gloves, causing him to think that he broke his code of honor. Daizo is forced to arrest him for seemingly committing murder. Elsewhere, Starfire meets a little girl who helps to overcome her depression and make her realize that despite Robin's earlier objections, their feelings for each other are indeed mutual.