The Master is a recurring antagonist on the British sci-fi show Doctor Who. Although the Doctor says they are last of the Time Lords, they soon find out otherwise. But unlike the Doctor, who uses his abilities and knowledge to heal, the Master wants to harm. The Master (Roger Delgado) is first seen in "Terror of the Autons" (1971), where he forms an alliance with the Nestene Conciousness to invade Earth. The Third Doctor (Jon Pertwee) convinces him to stop the plan, but he escapes. His last appearance is in "Frontier in Space" (1973), where he works with the Daleks to provoke a war between humans and draconians. Again, he escapes, but he reunites with the Tenth Doctor as Professor Yana/Harold Saxon, and the Twelfth Doctor as Missy, her new title as a Time Lady. In the most recent season with the Thirteenth Doctor, the Master is back, revealed to inhabit her ex-MI6 ally, O.

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