An undercover agent devises a risky plan to expose the traitor who betrayed him and his colleagues.

Fans of the TV series will love this elongated version, with dynamic special effects, an all-star cast and a spectacular climax above a supercharged train in a tunnel.

On the downside, there are parts of the plot which are confusing and some of the dialogue will fly by your ears in a buzz of jumbled sound.

No matter, here's intrepid Tom Cruise as the agent whose colleagues - including Jon Voight's Jim Phelps and guest star Emilio Estevez - are almost all blown away in a mission that proves all too impossible when somebody betrays it.

Are they all really dead? Who are the mysterious Max and Job? Are the guys Cruise hires to help him really on his side?

To answer these questions, look sharp to spot some of the answers in a movie where dazzlingly exciting set pieces take centre stage.

And really it is an ever so slightly impossible mission - but with an impressive soundtrack.