TOM Cruise injured himself in London when a high-octane stunt went wrong while filming Mission Impossible 6.

Video footage shows the megastar who always performs his own stunts, taking a huge leap off some rigging onto a rooftop while attached to a harness, The Sun reports.

However the brave jump is misjudged as the 55-year-old slams into a building and is momentarily left hanging in the air.

Clearly shocked, Cruise hangs in midair for a few seconds before pulling himself up onto the rooftop and staggering towards the crew.

He then takes a moment to regain his posture as the crew tentatively watch on before limping away while holding onto his knee and wincing in pain.

Tom Cruise filming Mission Impossible 6 in London.
Tom Cruise filming Mission Impossible 6 in London. Splash

Cruise plays Ethan Hunt in the movie franchise which also stars Henry Cavill, Simon Pegg, Jeremy Renner and Vanessa Kirby.

Details of the plot in the upcoming movie are being kept under wraps.

Cruise's crash comes shortly after the CEO of Skydance Media revealed that the star will be performing the "most impressive and unbelievable" stunt of his career.

David Ellison told Collider: "What Tom is doing in this movie I believe will top anything that's come before. It is absolutely unbelievable - he's been training for a year.

"It is going to be, I believe, the most impressive and unbelievable thing that Tom Cruise has done in a movie, and he has been working on it since right after Rogue Nation came out [in 2015]. It's gonna be mind-blowing."

Let's hope it doesn't involve any walls.

This article was originally published on The Sun