Peter Capaldi has revealed Brian Blessed once punched him so hard on a BBC set that he was knocked out and had to be rushed to hospital.
Capaldi said his co-star was meant to hit him as part of the scene but that Blessed got 'over-excited'.
The 63 year old revealed he woke up dazed with paramedics tending to him - and was taken to hospital still in his period costume.
Capaldi, speaking to film news magazine Empire, said the incident happened while he and Blessed, 85, were filming for 1990s BBC show The History of Tom Jones: a Foundling.
He said: "I've got a scar under my eyebrow that runs the length of my eyebrow. That's when Brian Blessed punched me in the face. I got nine stitches.
"We were filming the old BBC version of Tom Jones and I was playing a fop in a powdered wig and make-up, he was playing a squire, from the country.
"I was attempting to seduce his daughter and in the scene he punched me, but he got a bit over-excited.
"I woke up on the floor with two ambulance men pulling at my powdered wig.
"I was wheeled off to hospital in my fop outfit, with a beauty spot.
"Poor Brian was absolutely distraught."
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