Matt Smith, David Tennant, Christopher Eccleston, Peter Capaldi and Paul McGann, face off against Steven Moffat in the finale to the Doctor Who VS Moffat Trilogy.
Moffat has gone insane and is sealing people away in paper, much like in the 2006 Doctor Episode "Fear her", Matt Smith is taken by him and it's up to his friends to save him.
When Peter Capaldi find out Clara has been killed off in Doctor Who, he goes on a rampage and recruits the "New Who" Doctor's, to help him kill Steven Moffat.