The Ultimate Adventure (stage play)

Doctor Who: The Ultimate Adventure was a musical stage play mounted during 1989. Jon Pertwee reprised his role as the Third Doctor for the initial run of the play, and the remaining run saw Colin Baker take over as the Sixth Doctor. During Pertwee's run, the actor fell ill for a couple of performances and his understudy, David Banks (best known for his Cyberman acting work on TV) briefly played a unique incarnation of the Doctor.

Summary
the Daleks and the Cybermen form an alliance to kidnap the American Envoy and ruin a peace conference on Earth. The Doctor meats a new companion in the form of a Frenchman nicknamed Jason, who after failing to stop the Cybermen take the US Envoy from a nightclub are joined by a singer named Crystal, who works there. After a trip to Altair Three and then the Bar Galactica, they meet Madame Delilah but are forced to flee along with a small furry creature called Zog.

The time travellers are captured briefly by the Daleks and navigate the ship through an asteroid field before making a series of short trips, before arriving to confront the Dalek Emperor. The Doctor tricks the Emperor into revealing that the Daleks intend to betray the Cybermen and a battle breaks out between the two. Returning to Earth, the Doctor realises the US Envoy is under Dalek influence and programmed to destroy London with a Dalekanium bomb. The Doctor breaks his conditioning and defuses the bomb by putting it in a teapot.

Characters

 * Third Doctor/Sixth Doctor/Unknown Doctor (depending on lead performer)
 * Jason
 * Crystal
 * Zog
 * Karl
 * The Daleks
 * The Cybermen
 * Madame Delilah
 * Margaret Thatcher

Continuity

 * Face Value is a sequel to this story.
 * Due to the fact that it is a musical, coupled with the fact that three different actors played the Doctor at different times during its run (including the David Banks incarnation which has no equivalent in mainstream continuity), the play is not considered canonical. However Big Finish is releasing an Audio drama based on this Play which may be considered a part of Big Finish canon.

Remakes

 * Terrance Dicks has stated that he intended to write a novelization of the play, but Target Books chose not to publish it.
 * In 2008, Big Finish announced it would be producing an audio drama version of the play, complete with the original score. Colin Baker will reprise the role of the Doctor.