In an interview on BBC Radio 4 Brian Blessed claimed he delivered a woman's baby in Richmond Park, bit through the umbilical cord, then licked the baby's face clean.
The larger-than-life actor, who is originally from Mexborough - made the startling revelation on the Midweek show hosted by Libby Purves.
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He claimed the events unfolded one day in 1963 while he was filming Z Cars
Blesssed said: "I was in Richmond Park and a woman was having a baby under a tree and there was nobody around. I rushed over to her.
"I told her to breathe deeply and I delivered the baby. I got the afterbirth out, then I bit it loose and tied it into a knot and then I called for help.
"My shirt was covered in blood. I was saying 'it's alright darling' and I was licking the baby's face."
"You would tell her to breathe deeply and push, push, push, because I'd seen my mother do all this. I was always kept in the background, because all the neighbours were kind of midwives."
Blessed attended Bolton on Dearne Secondary Modern School, but was forced to leave at the age of 15 after his father suffered an industrial accident
He first made his name as an actor in the hit 1960s police drama Z Cars, and went on to star in The Avengers, Randall and Hopkirk (Deceased), and Hollywood blockbuster Robin Hood: Prince of Thieves.