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This is a Space Invaders variant with a twist. Eight robots with laser cannons and protected by a shield wall are advancing in the player's sector, and with his laser cannon he has to destroy them. The shield wall is indestructible, but the robots and the cannons aren't. They'll go from side to side of the screen in an alternate movement shooting down. Three high density molecular laser shields are placed in defense of the laser cannon. Each one of them houses an extra cannon.

Instead of a passing flying saucer as seen in Space Invaders, the player has to face the Merciless Monstroth, which shoots against him. The player controls a robot defender inside the laser cannon. If the laser cannon is destroyed, the robot will be left unprotected. The robot can enter in a new laser cannon housed in one of the shields. Once the new laser cannon is active, the shield is gone. Once the three shields are gone, the Merciless Monstroth will come down to hunt the player's cannon and robot.

The player wins a battle when destroying all enemy robots and cannons on the screen. A battle is lost when the player's robot is destroyed. The first side to win ten battles wins the war.


Alien Invaders - Plus! Odyssey 2 My robot was shot, I lost this battle.
Alien Invaders - Plus! Odyssey 2 All my shields are gone, this is my last cannon.
Alien Invaders - Plus! Odyssey 2 Hah, I won this one!
Alien Invaders - Plus! Odyssey 2 Oh no, my laser cannon was shot and now my robot is defenseless.

Promo Images

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Alternate Titles

  • "Space Monster" -- UK title
  • "Rymd-monstret" -- Swedish title
  • "Rumuhyret" -- Danish title
  • "Ruimte-monster" -- Dutch title
  • "Mostro Spaziale" -- Italian title
  • "Monstruo Espacial" -- Spanish title
  • "Monster" -- Jopac release title
  • "Le monstre de l'espace" -- French title
  • "Envahisseurs Extra-Terrestres!" -- Canadian French title
  • "Das Weltraum-Monster" -- German title
  • "Alien!" -- Brazilian title

Part of the Following Groups

User Reviews

A rather unique interpretation of Space Invaders Odyssey 2 Bruce Clarke (72)
An interesting take on the Space Invaders theme Odyssey 2 Katakis | カタキス (42875)

Critic Reviews

Retro Game Reviews Odyssey 2 Sep 02, 2016 8 Stars8 Stars8 Stars8 Stars8 Stars8 Stars8 Stars8 Stars8 Stars8 Stars 80
JoyStik Odyssey 2 Dec, 1982 5.3 out of 10 53
The Video Game Critic Odyssey 2 Jan 27, 2001 F 0


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Contributed to by chirinea (47082) and Alaka (88059)
atari mania