In his first taste of South Australia's biggest sporting rivalry, Steven Motlop has become a Port Adelaide hero with a last-gasp goal to break Adelaide hearts in the 44th Showdown.
Motlop’s major, with 21 seconds remaining, handed the Power a 14.11 (95) to 14.6 (90) victory in a thrilling contest that snaps a five-game Adelaide winning streak and levels the all-time ledger at 22-all.
Down by 17 points late in the last quarter, the Crows looked to have stolen the premiership points after Mitch McGovern's 50m set shot gave them the lead with less than a minute on the clock.
But Motlop had other ideas, kicking on the run from 45m, the ball sailing through the posts and sparking rapturous applause from the 50,967-strong crowd.
Power star Robbie Gray claimed his third Showdown Medal as best on ground for his six-goal performance, including five in a dazzling third quarter.
Everything turned on its head in the pivotal third term, with the Power booting 7.5 to 2.2 to take a 12-point advantage into the last quarter.
It's a huge result for the Power, who are back inside the top eight at 5-3 ahead of next Saturday's trip to China to face Gold Coast.
The depleted Crows, with a huge injury list that includes Rory Sloane, Kyle Hartigan, Riley Knight and Brodie Smith, suffered their first loss after three straight wins to drop to 5-3.
Down by 27 points in the second quarter, the Power looked to have the game in the bag when they went ahead by 17 points late in the last term.
But the Crows found another gear – Betts kicking his third major, skipper Taylor Walker nailing a huge captain's goal from outside 50m and McGovern sensationally putting them back in front.
High-profile recruit Tom Rockliff showed why the Power signed the free agent to a four-year deal with a powerful midfield performance, finishing with a game-high 31 disposals, in his first game back after spending the past two weeks in the SANFL in his comeback from a calf injury.
Power defender Tom Jonas was absolutely superb and unlucky to have his direct opponent Betts finish with three goals.
Midfielder Sam Powell-Pepper was strong in his first game back after missing the past four due to a club suspension and related fallout for an off-field incident.
Winger Rory Atkins and midfielders Cam Ellis-Yolmen, Matt Crouch and Hugh Greenwood were the best for the Crows.
PORT ADELAIDE 1.3 4.6 11.11 14.11 (95)
ADELAIDE 4.2 8.3 10.5 14.6 (90)
GOALS
Port Adelaide: R.Gray 6, Wingard 2 Ryder 2, S.Gray, Boak, Powell-Pepper, Motlop
Adelaide: Betts 3, Ellis-Yolmen 2, McGovern 2, Walker 2, Atkins, Jenkins, Douglas, Seedsman, Lynch
BEST
Port Adelaide: R.Gray , Jonas, Polec, Rockliff, Jonas, Neade, Ryder
Adelaide: Laird, Atkins, Crouch, Talia, Gibbs, Ellis-Yolmen
INJURIES
Port Adelaide: -
Adelaide: -
Reports: TBC
Umpires: Donlon, Haussen, Meredith
Official crowd: 50,967 at the Adelaide Oval
