Here’s a reason to be happy for Internet radio: BBC Radio 4 will get medieval on our asses with a Dec. 21 dramatization of Sir Gawain and the Green Knight. This 15th century poem may not replace It’s a Wonderful Life as a favorite Christmas story, but it does offer a unique spin on how to have fun with your friends come Yuletide. It will also be narrated by Ian McKellen, which should help those of you in the throes of Gandalf-withdrawal, now that it appears Peter Jackson won’t be doing The Hobbit after all. The production won’t be using J.R.R. Tolkien’s translation, but a new translation by poet Simon Armitage. His first novel was called Little Green Man, so I guess he’s got a thing about green guys.