T1, E4: Episode 4 sees Honda TT Legends take on their most dangerous assignment - the Isle of Man TT. A race like no other on Earth, it takes total commitment and years of hard work to learn the 37.73 mile course - many never do. John McGuinness is known as the 'King of the Mountain' for his uncanny skills on this most demand circuit which rises from sea level to over 1400 ft. He's won the race more times than any other living rider. In 2012 he returned to the Mountain Course looking to add to his tally of 17 wins. Cameron Donald, John's Honda TT Legends team mate has won the race twice but he's determined to win it again and John knows he's a big threat. Simon Andrews has only raced in the Isle of Man once before and needs to learn quickly to keep up with his more experienced rivals - as he finds out though the Mountain Course is no place to make mistakes...