Phantasy Star is a series of console role-playing video games and other supplementary media created by Sega. The series debuted in 1987 on the Master System with Phantasy Star, and continues into the present with Phantasy Star Online 2 and other extensions of the Phantasy Star Online sub-series. Each of the games in the series features a science fantasy setting featuring a cross-genre combination of magic and technology.

A role-playing video game, a role-playing game (RPG) or computer role-playing game (CRPG), is a video game genre where the player controls the actions of a character immersed in some well-defined world, usually involving some form of character development by way of recording statistics. Many role-playing video games have origins in tabletop role-playing games and use much of the same terminology, settings, and game mechanics. Other major similarities with pen-and-paper games include developed story-telling and narrative elements, player character development, complexity, as well as replay value and immersion. The electronic medium removes the necessity for a gamemaster and increases combat resolution speed. RPGs have evolved from simple text-based console-window games into visually rich 3D experiences.