The Avengers and GUARDIANS OF THE GALAXY's Groot team up to perform some holiday classics in a new supercut uploaded to YouTube - check it out, via EW, below!
Joss Whedon direcst the highly-anticipated AVENGERS: AGE OF ULTRON, starring Robert Downey Jr., Chris Hemsworth, Mark Ruffalo, Chris Evans, Scarlett Johansson, Jeremy Renner, Samuel L. Jackson, Aaron Taylor-Johnson, Elizabeth Olsen, James Spader, Cobie Smulders, Thomas Kretschmann and Paul Bettany.
AVENGERS: AGE OF ULTRON will hit theaters on May 1, 2015.
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