War in Space (1972)
Here's why I loved "War in Space." Green-skinned aliens (under the command of a Roman centurion) invade Earth. They destroy most of popular tourist destinations (e.g. the Eiffel Tower, the Golden Gate Bridge) until the Japanese finish work on a flying submarine that chases them back to their hideout on Venus. The submarine is infiltrated and the only woman on board who is part of a love triangle involving two best friends is kidnapped. She is held hostage by a giant horned yeti that carries a big axe. Nearly everyone dies trying to save the woman and then Venus is blown up. Absolutely barmy with lots of macho carry-on, toy spaceships whizzing around on conspicuous strings and plenty of explosions. From the good people at Toho who brought us Godzilla and co.