Invasion aus dem Innern der Erde

This film has historical importance: it was the first superhero film that was made in China, the first film promotion in Hong Kong that used a hot air balloon, and the first Shaw Brothers production that used a storyboard.

During several of the fights between the creatures and the Silver Suited Men in the film, several of them have tears in the crotches of their uniforms (which can be seen when the men land on their backs and their legs are not close together).

The U.S. English-dubbed version has a completely different title sequence (except for when the "transformation" animation from the background of the original Hong Kong credit sequence has been reworked into the beginning of the U.S. credits) that replaces and deletes some of the original music (as well as adding library music into appropriate scenes), and all of the sequences of Lei-Ma's standard transformation into Infra-Man have been cut.

Featured in Siskel & Ebert & the Movies: Guilty Pleasures - 1987 (1987)