He played a stony-faced Vulcan with two hearts and no emotions.

But Star Trek actor Leonard Nimoy was secretly a raging alcoholic who enjoyed kinky group ‘love-ins’ with his first wife, his best pal William Shatner has revealed.

Spock star Leonard – who died last February 27th aged 83 from lung disease – drank to numb the “sheer disappointment of stardom” said William.

(Image: REX)

And William, who played the Starship Enterprise’s Captain Kirk in Star Trek, said Leonard once confessed how he took his wife to hippie love-ins which involved a “lot of embracing”.

William, 84, wrote at length about his friendship with Leonard in the Daily Mail as the first anniversary of his old pal’s death approaches.

He said in the piece: “Leonard’s first wife Sandi was a force of her own, who wore groovy clothes and loved rock ’n’ roll.

“The Nimoys even went to love-ins, parties where people explored their intimate feelings together. 'It wasn’t quite group sex', he told me, but there was a lot of embracing’.”

Leonard, the son of Ukrainian Jewish peasants, married Sandra ‘Sandi’ Zober in 1954 and divorced her in 1987 – reportedly walking out on the actress on her 56th birthday.

(Image: Getty)

He got remarried on New Year’s Day 1989 to actress Susan Bay, cousin of action film director Michael Bay.

William, 84, said Leonard’s drinking started to take over his life after Star Trek became a hit.

He added: “He started drinking heavily around 1967, during the second series of Star Trek. He had always enjoyed a glass or two of wine after filming, but gradually the ritual became so important that it took over his whole personality.

“When he directed, a secretary was on standby to bring him a drink in a paper cup, the moment the last shot was in the can.

Read more:William Shatner to write book about Leonard Nimoy

Read more:Star Trek: The Musical in the works?

“He hid this from the cast, never allowing it to affect his work. But on days off, he did nothing but booze. He’d break open the beer at 11am and drink steadily, until he passed out around 4pm. He wouldn’t regain consciousness until the next day, when he started drinking again.”

“Part of his problem was the sheer disappointment of stardom. He had been a struggling actor since his teens, making ends meet through various jobs, including driving a cab.”

(Image: Rex)

William added Leonard gave up booze after his second marriage.

Father-of-two Leonard died at his LA home and blamed the chronic lung disease that killed him on a 30-year smoking habit.

He said in an interview in 2001 about his boozing: “The minute we finished the last shot on Star Trek I would have a drink. Then it became a series of drinks, little by little. Before I knew it I was drinking more and more because my addictive personality was taking over."