Gorf

Galactic Orbiting Robot Force had an amazing synthesized attract voice.  I remember this game from some random trip to the Pizza Hut in Champaign-Urbana for god knows what.  It would periodically retort "Space Cadet". It sounded like SPAYZE CADUT but that was still pretty cool.  This game added several variations to the space invaders shooting formula with 5 separate play modes.  Laser attack and Flagship were both cool and the galaxians mode is well galaxians.