Intro: The antidote for a plague affecting the entire galaxy can be found only on the planet Exxilon, home of a savagely hostile and degenerate race. When The Doctor gets there he will find, as he usually does, more than he bargained for.

Outro: Next week, The Doctor returns to Peladon after a fifty year absence and finds the sacred monster is kicking up a fuss. The manifestations are manifold as we will learn next Sunday night at 11 when we meet "The Monster of Peladon." [source: ChicagoEpguides]