( CNN ) -- The Boston Bruins put down their hockey sticks on Monday and got decked out `` Frozen '' -style for a good cause . Bruins defenseman Dougie Hamilton would never have been Disney 's first choice for Elsa , the cartoon star of the hit `` Frozen '' movie . But he and forward Matt Fraser ( now known as Elsa 's sister , Anna ) brought a bit of Halloween fun to the sick children at Boston Children 's Hospital . Rounding out the cast were Bruins defenseman Kevan Miller ( Kristoff ) , forward Seth Griffith ( Hans ) , defenseman Matt Bartkowski ( Sven ) and defenseman Torey Krug ( Olaf ) . `` We 're all fans of it . I 've seen the movie , and I 'm a fan so I 'm not going to lie about that , '' Hamilton said on the team 's blog . `` It 's fun to be able to be something that 's popular and they all know it and make them smile . '' It appears the movie 's hit song `` Let It Go '' has even made its way into the players ' song lists . `` I 've heard the song a lot of times , especially with my niece singing , '' Krug said . `` I know the lyrics . ''
Boston Bruins hockey players dress up `` Frozen '' -style for annual . The team made their Halloween visit to Bruins . Bruins defenseman Boston Bruins was decked out as Dougie Hamilton . A few players knew the words to the movie 's hit song , `` Let It Go ''