Their bitter rivalry, back-biting and betrayals kept the nation transfixed.

Now, for the first time in more than 20 years, the bitches are back on screen together.

But those hoping that the TV reunion of Joan Collins and Stephanie Beacham means a Dynasty revival will be disappointed.

While they may still be dressed in the style of their 1980s characters Alexis Carrington and Sable Colby, they have instead joined forces for a less glamorous gig Ð the new Snickers advertisement.

Miss Collins, 78, and Miss Beacham, 64, are replacing A-Team star Mr T as the face of the chocolate bar.

The leading ladies have traded in the wealthy oil town of Denver for the locker room of a Sunday League football team for the advert, which is about “satisfying your inner diva”.

It opens with Miss Collins, in a royal blue gown, matching gloves and lavish jewellery, storming into the locker room after a match.

She furiously accuses a teammate of stealing her deodorant, before throwing a sock at him and insulting him. She is then handed a chocolate bar and, after taking a bite, morphs into a male footballer to the catchphrase: “You are not you when you are hungry.”

Miss Beacham then sweeps in, wearing a silver and lace gown with her hair piled high, shouting angrily about being substituted during the match.

The suggestion is that she too will need a chocolate bar to get back to her true male character and stop the diva behaviour.

Miss Collins said it was her idea to include Miss Beacham in the campaign, which runs for a month and will first be broadcast at 11.20am on Channel 4 on Sunday, January 22.

“When they said, ‘We need a similar lady to come on and be another diva’, I said, ‘Well, there’s only one choice - Stephanie!’ I mean, we had so much fun on Dynasty.”

Stephanie Beacham

Lives: Homes in UK, America and Spain

Romance: Split from husband John McEnery before appearing in Dynasty. Developed a reputation for romancing toyboys but is now settled with boyfriend Bernie Greenwood, a doctor seven years her senior. She credits him with saving her life twice, both times by spotting that she had skin cancer

Plastic surgery: After having treatment for skin cancer in 2009 and 2011, she has vowed never to go under the knife for cosmetic reasons. She has said: “I may be a grandmother but I feel fabulous”

Business: Bolstered her fortunes by creating a skin-care range for over-60s and stints on Celebrity Big Brother and Strictly Come Dancing

Career since: After Dynasty her career dwindled in the 1990s but she made a comeback in 2003 in ITV drama Bad Girls and was Ken Barlow’s love interest in Coronation Street in 2010

Joan Collins

Lives: Homes in the UK, America and South of France

Romance: Her third marriage, to Ron Kass, ended while she starred in Dynasty. Has been married to husband number five, Percy Gilbert, who is 46 to her 78, for almost a decade

Plastic surgery: She has denied she’s had a facelift and is against cosmetic surgery, saying that keeping out of the sun, moisturiser, and make-up is her secret to looking young on screen

Business: She has made millions from book deals - both fiction and self-help - and endorsements with brands including M&S, Olympus and Alexis Bittar luxury jewellery

Career since: Never repeated her Dynasty success, working more in theatre and on her books. In recent years has appeared on British TV in Miss Marple, Hotel Babylon and Footballers’ Wives. - Daily Mail