Therefore, its known narrative elements are not a part of the Doctor Who universe as we, on this Wiki, choose to define it. It may have been the basis for a similar story in another medium, however — and that story may indeed be valid.
- You may be looking for the unrelated TV story.
The Two Doctors was a proposed crossover between Doctor Who and the Marvel Comics character Doctor Strange, featuring the Seventh Doctor and Ace. In 1991, Doctor Who script editor Andrew Cartmel pitched the idea to Marvel UK editor John Freeman. The plot concerned a rock band who made a deal with a demon to ensure their success. Artist Lee Sullivan also created a piece of promotional art for the story. However, Marvel US editor-in-chief Tom DeFalco felt that the story would not be successful due to declining interest in Doctor Who following the 1989 hiatus, and it did not progress any further. 
- Despite this crossover not coming to fruition, the Seventh Doctor did indeed cross over with the Marvel universe in various stories featuring Death's Head.
- In 2018, after Lee Sullivan shared the art following Steve Ditko's death, Mike Tucker created a cover for a theoretical Target novelisation by Ben Aaronovitch, using Benedict Cumberbatch's portrayal of Doctor Strange from the Marvel Cinematic Universe.