A colourful title page exposing aliens, such as mutants and space ships. A fairly good copy of the arcade game 'Defender' with a few extras thrown in. You have the conventional 'smart' bomb to destroy everything on the screen, and hyperspace to transport you to another quadrant. The extras include a star gate to transport you to where a lander has just abducted a humanoid. Inviso gives you five seconds of invisibility and immortality for each life.

If you have four rescued humanoids under your ship you can fly into the star gate and be transported over three attack waves. You can play with one to four players and there are two speed levels. The game can be paused and restarted at any time. Joystick only, needs a 16K expansion. Cassette.