A man who worked in an office was assigned by his boss to plan the office Christmas party. The man chose a magician named Dr Cadabra for the entertainment.
When the Sixth Doctor and Melanie Bush showed up, the office worker assumed they were the magic act and put them to work. When it turned out that Dr Cadabra had been trapped in his own mirror, the man helped the Doctor defeat the alien in the mirror, though they couldn't save Dr Cadabra. (PROSE: Dr Cadabra)