'Sketchy' Andy takes the fledgling sport of slack-lining to new heights, performing aerial tricks like back-flips, BASEjumping off the line and soloing highlines in the nude.

American climbing dirtbag Andy Lewis is taking the discipline of slacklining into the future as he solos the worlds longest high-lines and masters the hardest aerial tricks, all the while pushing his equipment to the limit. As Andy goes higher, harder and faster with climbing, slack and BASE, we all have to wonder how far he can go before it's one step over the line.