Satellite in the Sky(1956)

Story of the first manned satellite in space, launched from England with commander Michael Hayden at the helm. It is the mission of the crew to test out the deadly "tritonium" bomb in outer space. Once he's left the atmosphere, Hayden discovers that he's been harboring a stowaway: reporter and anti-weapons activist Kim Hamilton. Everyone's life is placed in peril when the bomb affixes itself to the side of the satellite. As tension mounts, the crew and Kim race against time to defuse the bomb.