Slap bang on the border between the known universe and the realm of anti-matter lies the planet of "Zeta Minor". That's where the "Doctor" (Tom Baker) and "Sarah Jane" (Elisabeth Sladen) have to go to answer a distress call - and where they discover a professor "Sorenson" (Frederick Jaeger) who thinks he's found the ultimate solution to the energy crisis. Sadly, though, when they try to leave the ver mais...