For the Doctor and Nyssa, they pass near an area in space that was called the Arc of Infinity because it's the gateway between the universes of matter and anti-matter. The Doctor is attacked by a strange alien, initially billed as the Renegade, but then things get worse. It's another return to Gallifrey, only this time, the Doctor is in danger of suffering the same fate as Morbius, (q.v. The Brain of Morbius). An alien from the realm of anti-matter has been partially successful in bonding with the Doctor to get his polarity reversed. However, for that to happen, someone had to have given this alien the Doctor's bio-data extract, and only members of the High Council of Timelords have that power. The Timelords, still led by President Borusa, don't have time for that--they prefer the Doctor's execution to retain control of the Space-Time Matrix and prevent billions from being killed.
The Doctor has a few allies, such as Damon, a Gallifreyan technician who was on duty when the Doctor's bio-data was being accessed. There's also his old instructor Councillor Hedin of the High Council, a kindly person who manages to get Damon and Nyssa to visit the Doctor even though the Doctor is denied visitors under orders from the meticulous Castellan and his lackey, an unpleasant and trigger-happy commander named Maxil.Read more ›
This was a lackluster story. Why Amsterdam? The concept of the titular arc seems like a weak excuse for going "out on location". Also, oddly enough, the first victim of Omega's happens to be a cousin of ex-companion Tegan Jovanka - a flimsy way of writing her back into the show (she'd been left behind at Heathrow at the end of "Time Flight". In a wonderfully bittersweet moment, she looks unhappily surprised to have missed the Doctor's departure). Omega's mystery collaborator is little mystery, and the Gallifreyan setting with its many intrigues reveals the weaknesses of Davidson's Doctor (Baker was much more in control when dealing with the Castellan and Borusa characters).Read more ›