Thicker than Water

It is three years since the Sixth Doctor helped repel the Killoran invasion of Világ, and he brings a new friend, Mel, to meet an old one. Evelyn Smythe, his former companion is now married to Principal Triumvir Rossiter. But Evelyn has made political enemies, among them her own stepdaughter Sofia, and the reunion takes a deadly turn when Evelyn and Mel are kidnapped.