Hollywood megastar Tom Cruise has been practicing the most dangerous stunt ever for Mission: Impossible 8, which requires him hanging upside down on the wing of a World War II plane. The action star has wrapped up the seventh instalment of the franchise and recently announced the arrival of Mission Impossible 8. Tom Cruise was seen high above the skies of Cambridge, earlier this week, as he practiced climbing onto the plane wing as it did a loop-the-loop 2,000ft up in the air, reports The Sun.