S01E01 S.O.S. From Venus
While returning to Earth from a hazardous journey to Mars, the British rocket crew hear a mysterious distress call from the vicinity of Venus.
In answer to a distress call from a stranded astronaut; MR4 has diverted to Venus. By a trick, the rocket's univited guest Harcourt Brown has made pilot Henderson decide to land on the unknown world beneath the carbon cloud.
Returning from their unexpected trip to Mars the crew of MR4 intercept a distress signal from Captain Wilson, a U.S astronaut, and must change course for Venus to attempt a rescue in space. However, through the space periscope, Brown sees what appears to be a settlement or a city of some sort. Desperate to investigate, Brown edits Wilson's message and tricks the crew into landing Venus so as they can rescue him.