Here's the Trailer for HBO's Tennis Mockumentary with Andy Samberg and Jon Snow

We all know that Jon Snow knows nothing...but can he play tennis?

Kit Harington, who plays Ned Stark's bastard on HBO's "Game of Thrones," stars alongside "Brooklyn Nine-Nine" star Andy Samberg in HBO's new mockumentary "7 Days in Hell." The first trailer is here, and it looks pretty great.

The HBO original movie will follow Samberg and Harington's characters, two professional tennis players, as they go through a grueling, high-profile match. It's all presented as if it's an actual documentary, which is a meta move on the part of HBO, which specializes in the real version of this sort of thing.

There are even interviews with actual tennis stars like the Williams sisters and John McEnroe to add to the illusion!

We know from Samberg's resume that he's a veritable comedy star, but we can't wait to see how Harington handles a comedic role after all the brooding he's been doing on "Game of Thrones" these days.

Check out the trailer below: