Nemesis 2 may refer to:

Nemesis 2 (MSX), a video game released for the MSX in 1987
Nemesis II (Game Boy), a video game released for the Game Boy in 1991
Nemesis 2: Nebula, a 1995 film

Nemesis often refers to:

Nemesis (mythology), in Greek mythology, a spirit of divine retribution against those who succumb to hubris
Archenemy, the principal enemy of a character in a work of fiction
Nemesis may also refer to:

Moon Patrol (ムーンパトロール, Mūn Patorōru) is an arcade game by Irem released in 1982. It was licensed to Williams for distribution in North America. Moon Patrol is widely credited for the introduction of parallax scrolling in side-scrolling video games. Taito's Jungle Hunt side-scroller, released the same year as Moon Patrol, also features parallax scrolling.

Galaga (ギャラガ, Gyaraga) is a Japanese shoot 'em up arcade game developed and published by Namco Japan and by Midway in North America in 1981. It is the sequel to 1979's Galaxian. The gameplay of Galaga puts the player in control of a spacecraft which is situated at the bottom of the screen, with enemy aliens arriving in formation at the beginning of a stage, either trying to destroy, collide, or capture the spaceship, with the player progressing every time alien forces are vanquished.

Galaga is one of the most commercially and critically successful games from the golden age of arcade video games. The arcade version of it has been ported to many consoles, and it has had several sequels. In 2011, the game celebrated its 30th anniversary with the release of Galaga 30th Collection for iOS.