What was the title of the first Pokémon feature film released in English-speaking markets?

The first Pokémon feature film released in English-speaking markets was titled Pokémon: The First Movie.

Its full English title is Pokémon: The First Movie—Mewtwo Strikes Back. The film follows Mewtwo, a genetically engineered Pokémon who challenges human ideas about creation, identity, and strength. Ash, Pikachu, and their friends are invited to a mysterious island, where Mewtwo stages a major confrontation.

The film was released in Japan in 1998 under the title Pokémon: Mewtwo Strikes Back. For its international release, the subtitle and marketing were changed to emphasize that it was the franchise’s first theatrical movie.

A short film called Pikachu’s Vacation played before the feature in many markets. The movie became a major commercial event for Pokémon, helped by trading-card promotions and the popularity of the television series. Its English title is sometimes shortened informally, but Pokémon: The First Movie is the canonical market title.