Ep 22. Specimen: Unknown

A scientist military officer has found unknown mushrooms on the weather station satellite and died. The space crew returns to Earth with the sample that turns into white flowers which proliferate inside the shuttlecraft. They start to kill the astronauts by emitting poisonous vapors. Earth's militaries reluctantly allow them to land. The plants have already contaminated the crashed site, but, fortunately, a burst of rain occurs and eradicates them.