What subtitle was used for Pokémon: The First Movie in English?

The English subtitle of Pokémon: The First Movie was Mewtwo Strikes Back.

The film centers on Mewtwo, a genetically engineered Pokémon created from research involving Mew. After questioning its origins and purpose, Mewtwo invites Pokémon Trainers to New Island for a confrontation that becomes the movie’s central conflict.

The film was released in Japan in 1998 under a title commonly translated as Mewtwo Strikes Back. Its English-language release used the full title Pokémon: The First Movie—Mewtwo Strikes Back, clearly marking it as the franchise’s first theatrical animated feature.

The Power of One was the subtitle of the second Pokémon film, while Spell of the Unown belonged to the third. Those titles are plausible because each was part of the early movie era, but they refer to different stories and villains.