The Time Lords execute the Doctor

Tags: Fifth Doctor, Nyssa

Arc of Infinity, episode 2
5 January 1983

The Doctor has been urgently returned to Gallifrey. Using his illegally obtained bio-data, a creature from an anti-matter universe has formed a bond with him. It is Omega, lost founder of Time Lord society, intent on returning to this universe. To prevent the mutual annihilation of matter and anti-matter in collision, there is no alternative for the High Council but to execute the Doctor immediately....