Space Prisoner 303 (E07)

A hunting trip is interrupted when the hunters find a miniature spaceship, only for the pilot to kill them. Around the same time in space, the TDF's Space Station V3 receives transmissions from an alien source. V3's captain and Captain Kiriyama in the Ultra Guard try to understand the source, which turns out to be a warning about a violent interstellar criminal known as 303. (Prime Video)