Lynda Carter has Wonder Woman wardrobe malfunction helping Ryan Reynolds' Deadpool save the holidays: 'F---!'

Now this is a truly wondrous crossover. 

On Thursday, Ryan Reynolds' Deadpool teamed up with Lynda Carter of Wonder Woman fame for some holiday giving — but things quickly took a very ugly turn.

The video, posted on Reynolds' Instagram, begins with his vigilante superhero dropping off presents in Santa's sleigh with a little help from his multiversal mini-me, Kidpool. 

"Where to next?" Kidpool asks, to which Deadpool replies, "Well, I thought we'd eliminate sick kids," referencing his fundraising work for The Hospital for Sick Children.

His younger self immediately takes the bait, saying, "Oh, dude, that's so f----- up."

But Deadpool, of course, didn't mean it like that. "No, no, no! We're eliminating the sickness by encouraging people to donate," he stresses. "But we're gonna need some help, because you and I are technically R-rated and these are kids. Sick kids."

Related: Lynda Carter pays tribute to Wonder Woman stuntwoman Jeannie Epper: 'I will miss you'

Right on cue, Carter lands beside them in her signature Wonder Woman pose. "Did someone call for help?" she asks.

Deadpool and Kidpool then, rightfully, have a bit of a freakout at seeing the actress — who played Wonder Woman on screen in the beloved live-action television series from 1975 until 1979 — magically appear in front of them.

"Aren't you a… wonderful woman?" Deadpool says, raising his eyebrows at the camera. 

The Merc with a Mouth then explains that they are attempting to raise money for charity, before asking the actress if she'd do "the thing," a.k.a transform into her superhero alter ego.

Carter then spins around as Deadpool gleefully cheers, only for her to reveal that she has actually transformed… into a lady wearing a hideous Christmas sweater — complete with a golden bow at the front.

"F---!" Deadpool shouts, while an equally stunned Carter exclaims, ""Who did this?!"

Deadpool has a hunch. "The DC lawyers. I knew it," he groans. “Yeah, that's probably the same guy that got [Henry] Cavill. And that other Batman."

As the trio hops into the sleigh to continue delivering presents, the clip features a notice that confirms that Reynolds and his wife, Blake Lively, would be matching donations made before Christmas Day to The Hospital for Sick Children for up to $500,000. 

Related: Lanterns star Aaron Pierre hasn't seen the Ryan Reynolds movie, talks casting process (exclusive)

"We should probably go untie Santa," Kidpool can be heard saying in the background, to which a laughing Deadpool replies, "Never!"

This isn't the first time Reynolds has used the power of Deadpool for good. Once Upon a Deadpool, a PG-13 cut of Deadpool 2 released for the holidays in 2018, offered a portion of its ticket sales to the charity F--- Cancer — or, as it was renamed at the time, Fudge Cancer.

That same year, Reynolds also teamed up with the nonprofit organization LetsFCancer to give away a pink version of Deadpool's superhero suit. "This is one fight where everyone can be a superhero," he said at the time. "No superpowers, capes, or lame CG costumes needed — just your money. Seriously, we need that. These suits aren't cheap."

Watch Deadpool, Kidpool, and Carter save the holidays in the clip above.

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