Manchester United vs Arsenal - the confrontation they thought had been consigned to history but "the epic" is back.
Sir Alex Ferguson and Arsene Wenger, toe-to-toe for a place in the Champions League final.
Both have endured sticky moments over the last few years, since their rivalry was at its height, only to meet again on the biggest stage.
Ferguson is aiming to defend the Premier League and Champions League double Manchester United won so memorably last year while Arsenal have salvaged a season that seemed on the rocks and could yet clinch a first European Cup.
"You had me out of the door three years ago," smiled Ferguson, as he assessed the criticism Wenger has had to endure.
"You had me in a bath chair down on Torquay beach. That is the cynical world we are in.
"But Arsene has always kept his principles the same. His consistency hasn't changed and Arsenal have reaped the rewards."
If recent evidence is to be believed, these two old stagers of Premier League combat have put away their fighting tools and are now happy to hug.
After all, there are many common threads; a commitment to passing football, a willingness to embrace youth and a refusal to abandon tradition. Above everything else, they share a hunger and fierce determination to win.
"I like the way they play and also in their use of young players," said Ferguson.
"The history and tradition of both clubs has been the highest for years now.
"We always looked over our shoulders at Arsenal and they looked over their shoulders at us.
"Now we have Chelsea banging on the door. This season Liverpool are making a big effort.
"Our league is very tough. The top four are probably the best teams in Europe. That is shown in the fact we have three teams in the semi-finals again.
"But ourselves and Arsenal have certainly been the dominant forces.
"Those epic times are back with us and I am looking forward to a great match."
The similarities are so great, had either club been slightly quicker off the mark their respective line-ups tomorrow night could have been wearing shirts of the opposition.
Wenger was very keen on getting Cristiano Ronaldo from Sporting Lisbon, only to discover United had made the first move. Ferguson was equally attracted to Cesc Fabregas.
"Fabregas is a wonderful footballer," said Ferguson.
"You are always interested in the best young players but we didn't have a chance to sign him. Arsene was under the carpet before me."
Nevertheless, Ferguson has seen enough of the Spain midfielder to be wary even before Fabregas' two goals against Middlesbrough on Sunday.
"He has taken a few games to get his rhythm back (after injury) but he did very well," said the United boss.
Dangers abound for the Red Devils. Emmanuel Adebayor, another player Ferguson had an admiring eye on earlier in his career, is clearly a threat, while the Scot is placing his trust in Patrice Evra to do a better job of subduing the threat of Theo Walcott than he has managed with Tottenham's Aaron Lennon in a couple of meetings over the last few months.
"Walcott is very quick, probably the quickest forward in England at the moment," said Ferguson.
"But Patrice has played against him a few times. We are all right with that."
With John O'Shea's experience set to earn the Irishman selection at right-back ahead of Rafael, Ferguson's dilemma is over the offensive part of his line-up.
Ryan Giggs and Wayne Rooney could be used in wider positions, as they were so successfully in Porto, although Park Ji-sung's energy could also come into play, allowing the newly-crowned PFA player of the year to take up a more central station behind Cristiano Ronaldo.
When United lost to Arsenal in November, Ferguson left the Emirates declaring he had just witnessed one of the most high-quality games of his life.
The excellence is likely to be just as high tomorrow. But Old Trafford is set for a much cagier affair.
"It could be a cracker," said Ferguson.
"Looking at the tie and the players on view, you almost think this is a perfect semi-final.
"It is full of terrific footballers and has an appetising look about it.
"But it won't be decided tomorrow. I feel sure there will be a lot of football still to be played at the Emirates next week."