Stargate is a horizontally scrolling shooter released as an arcade video game in 1981 by Williams Electronics.

Created by Eugene Jarvis and Larry DeMar, it is a sequel to Defender which was released earlier in the year.

It was the first of only three productions from Vid Kidz, an independent development house formed by Jarvis and DeMar.

The player is armed with a beam-like weapon which can be fired rapidly in a long horizontal line ahead of the spaceship, and also has a limited supply of smart bombs, which can destroy every enemy on the screen.

There are fifteen types of aliens: The game starts with ten Humanoids inhabiting the planet.

The Humanoids can be killed by the player's weapon just as easily as the aliens can, so careful aim is required when firing near them.

This allows more advanced players to skip the easier lower levels and also get a great number of points, extra lives, smart bombs, and inviso energy.

The Family Computer port developed by HAL (renamed Star Gate, and later named Defender II for U.S. release) has some elements in common with their Millipede (renamed Milli-Pede, later named back to Millipede for U.S. release) and Joust ports, as well as Mike Tyson's Punch-Out!

The name Defender II has been used on many home ports and game compilation appearances, but not in arcades.

The Atari 2600 port was originally sold as Stargate, but was renamed to Defender II for a later re-release.

Eugene Jarvis, the game's creator, had a cameo role on the episode as "Delivery Guy #3".