Andy Samberg and Kit Harington team up in 7 Days in Hell, an HBO special presentation airing first on HBO GO and HBO NOW July 8, followed by its debut on HBO's main channel July 11 at 10 p.m. ET/PT.

7 Days in Hell tells the story of Aaron Williams (Samberg) and Charles Poole (Harington), two of the greatest fictional tennis stars of their day who also happened to be sworn rivals. In 2001, they met for what turned out to be the longest tennis match of all time.

Samberg and Harington get some comedic help from the likes of Fred Armisen, David Copperfield, Lena Dunham, Chris Evert, Will Forte, Karen Gillan, Filip Hammar, Jim Lampley, Howie Mandel, John McEnroe, Soledad O’Brien, Michael Sheen, Mary Steenburgen, June Squibb and Serena Williams – just to name a few.

Watch the trailer below and tune in beginning July 8.