( CNN ) It 's all fun and games in the world of comic book movies -- until pro football gets involved . Chris Pratt and Chris Evans -- two of the hottest actors in Hollywood because of their superhero roles in recent Marvel Studios movies -- are waging a friendly feud on Twitter , resulting in an epic bet over the Super Bowl . In one corner , we have `` Captain America 's '' Evans , a dyed-in-the-wool fan of the New England Patriots . Evans landed the first blow Monday with a tweet to Pratt that said in part , `` For the next 2 weeks , you are not my friend , you are my enemy . '' In the other corner , we have Pratt , the `` Guardians of the Galaxy '' star , who roots for the Seattle Seahawks . Pratt quickly fired back with a dig at Evans ' Marvel character . Then Evans upped the ante . Pratt framed the first half of the bet : If the Patriots lose , Evans must come to Seattle and visit a children 's hospital in his superhero duds and waving a Seahawks fan-club flag . And Evans responded in turn , daring Pratt to come to a Boston pediatric cancer center dressed as Star-Lord from `` Guardians . '' And so the bet is on . It 's always possible that this exchange is a joke or a promotional stunt -- Evans ' Captain America co-stars in `` Avengers : Age of Ultron , '' hitting theaters May 1 -- but the Super Bowl just got a little more exciting . Now Marvel just hopes the two will mend fences after the game on February 1 .
Marvel stars Chris Evans and Chris Pratt made a Twitter bet over the Super Bowl . Pratt is pulling for the Seattle Seahawks , Evans for the New England Patriots . Both agreed to appear in their Marvel characters for charity if they lose .