Galaxy Express 999 Season 3 Episode 6 Kasumi of the Mist Capitol

The suitcase with Tetsuro and Maetel's passes is stolen. However, the thief collapses while making their escape. It turns out the people on this planet have only one percent of a normal human's physical strength. Even a gunshot from their guns barely stings. They easily get their suitcase back, but the passes are counterfeit!