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Now we know what that secret Deadpool Christmas project was. And even cooler, we now know it's for a good cause - specifically, for the SickKids Foundation, which raises funds on behalf of The Hospital for Sick Children in Toronto. A new plug for the foundation was posted to Ryan Reynolds's social media December 12, and featured Reynolds returning to his Marvelous red undies along with daughter Inez, who reprises her Kidpool role from Deadpool & Wolverine. But the standout appearance comes from none other than Lynda Carter, reprising her legendary role as DC Comics own - 

Oh wait, nevermind. Watch the video below.

In the ad for SickKids posted above, which ends by promising Reynolds and partner Blake Lively will match donations to SickKids of up to $500,000 made before December 24, Lynda Carter shows up and very nearly dons her old Wonder Woman costume, going so far as to perform her classic spin that saw her transform into the DC Comics icon in the Wonder Woman TV series that ran from 1975 to 1979. Unfortunately, the DC/Marvel crossover doesn't end up working out, as Carter only sees her outfit transform into "one  [CENSORED] ugly sweater," in Kidpool's words.

Now to be quite honest, Deadpool's crack that Wonder Woman couldn't appear because of "the DC lawyers, I knew it" is probably just a wiseass remark typical to the character. Actually, you might recall Popverse's reporting on why DC and Marvel crossovers aren't happening anymore, and the reasons are a lot more complex than some Scroogey lawyers at Warner Bros. Though they're certainly a factor, it's not like there aren't any equally Humbug-types over at Marvel.

Perhaps the coolest thing to get out of this ad, though, isn't that some of the Big Two's most iconic heroes almost shared the screen, it's that some of their most iconic performers are doing heroic things off ot it. In particular, Lynda Carter has proven herself to be as much a champion of the people as her Amazonian screen persona, advocating for the sick and the oppressed many times in her storied career. For example, she served as Grand Marshall for both the Phoenix and New York Pride Parades in 2011, four years before the Obergefell decision guaranteed legal gay marriage in all 50 US States. 

To bring this back to Deadpool's wisecrack, there really are some D.C. lawyers that would rather not have Lynda Carter do her thing, though not exactly the ones he was joking about. But she's continued her "wondrous" work, magic Warrior suit or no.

Want more? Make sure you've read our list of all the best Marvel Comics stories of all time, and get ready for all the free Marvel comics coming as part of this year's Free Comic Book Day / Comics Giveaway Day events.