Pack your flippers and goggles.

Nathan MacKinnon is the Missy Franklin of this Stanley Cup tournament.

Who else could lift 18,000 Avalanche faithful off their seats with a goal so impossible it took a half-dozen slow-mo replays to figure out exactly how he pulled it off? No. 29. That’s who.

The Avalanche erased a 3-0 deficit to beat the Minnesota Wild 4-3 in overtime at Ball Arena on Wednesday in one of the wildest comebacks since the team arrived here in 1995. The loud, proud triumph clinched the series, 4-1.

“I wish it was easier. That one was something,” Avalanche coach Jared Bednar said with a grin.

And it was MacKinnon’s game-tying goal with 1 minute, 23 seconds left in regulation that completed the comeback and helped move the Avalanche into the Western Conference finals.

He gathered a pass from Martin Necas. His stick went tap-tap-tap. Then it went boom, blasting the puck over the broad right shoulder of Minnesota goalie Jesper Wallstedt and just inside the near post of the net. How? 

“I just saw a little daylight and just threw it there,” MacKinnon said.

Brett Kulak’s overtime goal won it for the Avalanche.

Whether it’s Anaheim or Las Vegas in the next round, MacKinnon can continue his game-day routine of swimming in the hotel pool. Weather should be nice. Caught on video swimming laps with goggles and flippers at a Minnesota hotel early in this series, MacKinnon has scored goals in six straight games, the longest active streak in the NHL. No one else right now is like him.

“It was a heckuva shot by an unbelievable player,” Minnesota coach John Hynes said.

A decade down the road, the diehards will remember this series against Minnesota was much tougher than a gentleman’s sweep indicates. Down two regulars, the Wild skated furiously in Game 5, stunning the Ball Arena crowd. It was quiet enough a pack of five Wild fans sitting on the boards started a chant of “Let’s go, Wild!” that echoed all the way up to the 300s level.

The Wild built a 3-0 lead that suggested this series was headed north for a dangerous Game 6.

“That’s a great team over there,” Avalanche forward Parker Kelly said.

Then Kelly scored on a deflection, his second goal in as many games.

Then Jack Drury scored, cutting the hole to 3-2. 

Then Nate Dog happened. He usually does.

Bednar actually pulled two goalies on Wednesday. He pulled Mackenzie Blackwood after a first period in which Blackwood allowed three goals on 13 shots. Then he pulled Scott Wedgewood to give the Avalanche a man advantage as the game clock ticked toward a Game 6.

“It’s the most stressful comeback in my career,” Bednar said.

The Avalanche getting goals from 16 players over a five-game series is a testament to the depth built by general manager Chris MacFarland, a finalist for the NHL’s Executive of the Year.

“That’s a great stat,” MacKinnon said.

But the long, grueling hunt for a Stanley Cup still comes down to the star power on the top line and the goalie in net.

So why was MacKinnon swimming laps in a Minnesota pool when it was just a week ago we had snow in Denver? Thanks to Erik Johnson, we have an answer. The Avalanche-turned-analyst went on the “Pat McAfee Show” on Wednesday and said the whole team often swims with flippers and goggles. 

“The pressure of the pool when you go low enough clears the lactic acid from their legs,” Johnson said, joking he used to rock a Speedo while MacKinnon opts for swim trunks.

“This guy’s a complete lunatic — in a good way — about finding an edge to stay on top of his game,” Johnson said.

And MacKinnon’s game-tying goal was lunacy, turning Ball Arena into a rock concert with MacKinnon on lead vocals.

“That was fun,” he said late Wednesday night. “A lot of fun.”

Splish, splash.

The MacKinnon Show is swimming forward with no sign of slowing down.