Aliens plan to conquer the Earth, however the mighty Gamera spoils their plans by destroying their ship. The aliens (in another ship of course) instead use two annoying cub scouts in a submarine to trap Gamera and put him under their control.
Gamera then destroys Tokyo, which has probably only just been rebuilt after the last time Gamera destroyed it. Finally, Gamera is released from the alien spell but then has to battle Viras the giant space squid...
This is the usual Japanese monster fare but includes little you have not seen before (sometimes literally as this is padded out with footage from earlier films). Its OK but there are better monster films out there.
