Racing:Exotic Dancer became only the third horse to complete the Paddy Power Gold Cup and £150,000 boylesports.com Gold Cup double in the same season when taking top honours in the latter contest at Cheltenham.
Previously, Pegwell Bay's exploits in 1988 had only ever been matched by those of Senor El Betrutti, who claied both races back in 1997.
In almost identical fashion to his victory in the first-named contest four weeks ago, Jonjo O'Neill's charge crept into the race quietly before pouncing up the home straight.
He led with a flying leap at the last and stayed on willingly for Tony Dobbin to lift the prize in game fashion by a length and a half from Knowhere.
Tony McCoy had partnered the six-year-old when he achieved the first leg but was required to ride for JP McManus this time and Dobbin produced a copybook ride to gain the day.
He settled his mount in last place throughout the early stages and did not ask him to take closer order until the field began to bunch together after the sixth-last obstacle.
From that point on, Dobbin elected to ease into a challenging position up the inside of his rivals and turned into the home straight moving ominously well.
Knowhere had been prominent all the way and was still full of running, however, while the well-backed 3-1 favourite Taranis was also moving with menace.
The trio jumped the last two fences well but it was Exotic Dancer who gained the upper hand shortly after touching down after the final fence.
He stuck to his task well from then on to repel the Nigel Twiston-Davies-trained Knowhere and land odds of 8-1.
Taranis did not go down without a fight but had to settle for the bronze medal, three and a half lengths behind the front two.
O'Neill told Channel 4 Racing: "Tony gave him a grand ride. Tony (McCoy) told him what to do and thankfully everything went according to plan.
"I can't really believe it to be honest. I said to Tony that he can stop himself but it all went right.
"I think to be fair to the horse he has always had the ability and he was probably just a big, weak horse. He probably just hadn't filled into his frame.
"He's done it sweet today and he battled so you can't call him too much after that.
"He's in the King George so we'll have a look at that as something has to be second to the other horse (Kauto Star)!"
Twiston-Davies said: "I am absolutely thrilled - he's a novice. He'll go for the Feltham (at Kempton on Boxing Day) and then on to the SunAlliance at the Festival.
"The ground won't matter, he seems to handle anything and nothing seems to worry him whatsoever."
Paul Nicholls said of Taranis: "Ruby (Walsh) said he didn't handle the ground. I was slightly worried about it, but all things considered he has run really well.
"I've no idea where he will go next, but he will win a nice race in the spring on better ground and he'll be better over three miles in time.
"Thisthatandtother ran a cracking race with top-weight, but Cerium didn't handle it (the ground) at all, which is strange."