The Traveller:
HEE HEE HEE HOO HOO HAH HAH HAH HO HO LOLOLOLOL GIGGLE
One of my favorite Big Finishes ever is
The One Doctor, where the Sixth Doctor shows up to find a celebration under way for the magnificent victory just concluded by "The Doctor", in this case, a con artist impersonating him and scamming the locals with a fake invasion. Our Doctor is roundly lambasted for trying to steal the fraud's glory. With a predictable reaction.
And then the
real alien menace shows up....
So a similar gimmick to
The Next Doctor except played as a full-on farce. Mel is everyone's straight man in the story, and Bonnie Langford is magnificent at it.