Guardian is an arcade-style shoot 'em up video game for the Atari 2600, developed and published by Apollo, Inc. in 1982. Players control a spaceship, seeking to defend the planet from waves of alien attackers, drawing inspiration from games like Defender. It's known for its fast-paced action and retro 2D graphics. The game was part of the golden age of arcade gaming and is remembered for its contribution to the genre.