They Shall Not Pass was a one-page splash-panel parodical comic story in Tim Quinn and Dicky Howett's The Doctor Who Fun Book. Like Cut!, it seemed to take place in a universe where actual "monsters" starred as the monsters in Doctor Who, rather than in the Doctor Who universe per se or in a more down-to-earth depiction of the behind-the-scenes of Doctor Who (as was provided in comics like Introduction).
A security guard says that he cannot let a cast member into the BBC Television Centre on the basis that they said they were a Doctor Who cast member, given that anyone could claim to be an actor on Doctor Who. The guard appears to be overlooking the fact that the person he's talking to is a humongous Zygon.
- The Zygon has forgotten their pass.