The Doctor (Fourth); Brimo, the Time Witch; Sharon Davies; K-9
Brimo, the Time Witch is imprisoned for all eternity, eventually being sucked through a black hole and into a dimension where all her wishes come true. A portal to this dimension opens in the TARDIS and sucks The Doctor through.
Zeg, the Dalek inventor, accidentally creates a process that strengthens him beyond other Daleks, and offers to share the secret if he is made Emperor. A duel between Zeg and the current Emperor ensues.
The Cybermen land on the planet Goth, searching for a lost trove of superweapons. Cyberman Loktar has a strange premonition in a dream, and a mysterious figure stalks the Cybermen on the ruined planet.