Nothing but pure dreck!! Daiei studios was going bankrupt and they waited 9 years to bring Gmaera back in hopes it would rescue the studio. Now, I don't know about you, but if I was going bankrupt I would try to make a good movie. Well this isn't one and the studio never recovered.
They shot about 15 minutes of new footage and wrapped it around stock footage of Gamera fighting all the monsters he had fought in the past. My God, what crap!
Aliens are intent on taking over earth using all of the monsters and three alien women help try and save Earth. Why bother? If earthlings make movies like this we don't deserve to survive. This is easily the WORST Gamera film ever. He wouldn't be seen again on screen until 1995 when the series improved 90%.
Not much to write about this except to warn you to skip this film if you value your sanity.