There is nothing I love more than Halloween Costumes based on obscure properties and brother does this fit the bill. Space Giants was a 60's Japanese TV series that ran in syndication until the late 70s. This outfit was actually produced towards in the tail end most likely due to a renewed interest in science fiction due to Star Wars.
This is the first costume I've seen where the character has to explain who he is.
If you have the costume for the series villain Rodak please contact me as I know a very interested party.