Final Fantasy VII is the seventh installment in the Final Fantasy series, and the first to use 3D graphics. It is known for popularizing the PlayStation and the use of 3D polygonal characters. Gameplay elements include turn-based random battles found in earlier Final Fantasy games as well as the use of power meters to unlock special moves, the use of materia orbs to customize character skills, and the use of elaborate summon spells. The player is first tasked with helping a resistance group fight against the in-game corporation Shinra, then to save the world from being damaged and subjugated by the villain Sephiroth. There is an animated movie that continues the story after the game's end.