The 343rd episode of Doctor Who airs on BBC1. This is the last story featuring Roger Delgado as the Master before the actor’s untimely death in June 1973. Madhav Sharma (Moonbase 3) guest stars. This marks one of the earliest collaborations between the Doctor’s various enemies (in this case, a one-time-only alliance between the Master and the Daleks).
This timeline entry leads to an entry covering this entire Doctor Who serial; there are plans to write new episodic entries in the future. You can support this effort!
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