The Mutants

STORYLINE

The Time Lords send the Doctor and Jo on a mission to deliver a sealed message pod to an unknown party aboard a Skybase orbiting the planet Solos in the 30th century.

Solos is due to gain independence from Earth's empire but its Marshal is determined to prevent this. He arranges the murder of the Earth Administrator and, with his chief scientist Jaeger, plans to transform Solo's atmosphere into one more suited to humans.

Ky, a young Solonian leader, is falsely accused of the murder and flees to the planet, taking Jo with him. The Doctor follows and joins them in an old thaesium mine. Ky turns out to be the intended recipient of the message pod, which opens automatically for him. Inside are stone tablets carved with ancient inscriptions...