Teen Titans: Trouble in Tokyo

Teen Titans Trouble in Tokyo is a 2006 television animated film adaptation of the DC Comics superhero team Teen Titans. It is set in the milieu of the animated series Teen Titans that ran from 20032006. The film premiered on Cartoon Network on September 15, 2006 and on Kids WB on September 16, 2006. Teen Titans head writer David Slack returned for this movie, having left the series after its fourth season which was intended to be the last season of the show. Clips from the movie were later reused in Teen Titans Go episode Dreams, as a dream Robin had in that episode.

Upon arriving Tokyo, after overcoming the language barrier Starfire kisses a Japanese boy and learns how to speak Japanese, much to Robins shock and jealousy and fighting a Godzillalike giant reptile, the Titans meet Tokyos own supernatural defense force the Tokyo Troopers led by Commander Uehara Daizo. He shows the Titans around the Tokyo Troopers headquarters, and when Robin questions him on Brushogun, Daizo claims that Brushogun is nothing more than an urban legend.Left with no villains to pursue, the Titans can do nothing else than to enjoy Tokyo as tourists. Beast Boy follows a cute girl around and is eventually lured to a karaoke bar, Cyborg goes to an allyoucaneat restaurant Raven searches for book stores to read and incidentally finds a book describing the origins of Brushogun. Robin and Starfire explore Tokyo, and during that trip they finally start to express their true feelings for each other. They are about to share their first true kiss together, when suddenly Robin starts to focus on Brushogun again, and tells Starfire that they are heroes and cant be anything more. Upset, Starfire flies away with tears in her eyes. ........

Source: Wikipedia