Mr. X is a thorn in Jake's side. We don't know a lot about this guy. He recognised Jake during the Mousenapping and had to be taken hostage. An enigma. He sits quietly in the corner of the room - giving everyone the creeps.

The only thing we know of him so far is that he was in a psychiatric hospital for the criminally insane. Not the kind of guest you want gatecrashing an already tense party.

"SHUT IT!"

Played by David Robertson

In a long and distinguished career, David has been a leading figure in introducing Shakespeare to new audiences. He was a co-founder of the Pocket Theatre and is currently Artistic Director of Theatre of the Dales which is touring A Winters Tale in the remote areas of Yorkshire. David has also regularly toured Wales Castles with The Wales Actors Company, playing amongst others Caesar, Lear, Oberon, Cymberline and Duncan.

Recent TV appearances include a Doctor in Emmerdale, Undertaker in Cold Feet and Magistrate in North Square. He has just completed filming Murder on the Orient Express as an Arms Dealer/ Murderer with Alfred Molina as Poirot.