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It's on! Chris Pratt and Chris Evans' Super Bowl battle turns into bet for charity

Chris Pratt, Chris Evans
AFP-Getty; Getty Images

Captain America vs. "Guardians of the Galaxy's" Star-Lord? Yep, that's happening! Or rather, Chris Evans and Chris Pratt (who played those characters in the movies), are going at it — having kicked off a competition on Twitter over which team will win the Super Bowl.

Who's got the more Super team: Chris Pratt or Chris Evans? We'll find out in February.Today

See, Chris Pratt is rooting for the Seattle Seahawks to win; Evans is rooting for the New England Patriots . And when those visions collided on Twitter, the two were ready to put it all on the line for their teams.

Well,+well,+well+@prattprattpratt,+looks+like+our+teams+are+going+into+battle.+For+the+next+2+weeks,+you+are+not+my+friend,+you+are+my+enemy

—+Chris+Evans+(@ChrisEvans)+January+19,+2015+

Pratt happily took up the gauntlet.

@ChrisEvans+We+both+know+there's+only+one+Captain+America+and+his+name+is+Russell+Wilson.+#SuperBowlBound+#LOB+#Repeat

—+chris+pratt+(@prattprattpratt)+January+19,+2015+

Your turn, Capt. America!

@prattprattpratt+them's+fightin+words.+Stakes?+#whatisaseahawkanyway+#somethingtombradyhunts

—+Chris+Evans+(@ChrisEvans)+January+19,+2015+

The next day, Pratt turned it into a battle for charity.

@ChrisEvans+OK.+Seahawks+win+you+fly+yourself+to+Seattle,+visit+@seattlechildren+hospital+as+Captain+America,+waving+the+12th+man+flag.

—+chris+pratt+(@prattprattpratt)+January+21,+2015+

It took until Wednesday, but Evans sealed the deal with his own bid (@chris_haven is the Twitter handle for Christopher's Haven, a nonprofit in Boston that provides support to families whose children are being treated for cancer).

@prattprattpratt+I+accept.+And+when+the+Patriots+humiliate+your+seachickens,+I+expect+Star-Lord+to+arrive+at+@chris_haven+in+a+Brady+jersey

—+Chris+Evans+(@ChrisEvans)+January+21,+2015+

But Pratt got one last zinger in:

@ChrisEvans+Humiliate+my+Seahawks?+Maybe+talk+to+Brady+about+deflating+your+expectations.+BOOM!+(legion+of)+You're+on+sucka.+😊

—+chris+pratt+(@prattprattpratt)+January+21,+2015+

Greatest impromptu Super Bowl bet ever! And the best part is that no matter who takes home the trophy on Feb. 1, it's the kids who'll win — with a visit from either Captain America or Star-Lord.

Stay tuned for some super developments.

Follow Randee Dawn on Google+ and Twitter.