Simon Donato and Paul Trebilcock enter a seven-day race through the Icelandic Highlands in the premiere of this documentary series following the two travelers as they journey to obscure places and participate in extreme activities.

The Fire and Ice Ultra foot race continues.

Simon and Turbo brave 10-foot ocean swells on paddleboards as they cross the 32-mile "Channel of Bones" between the Hawaiian islands of Molokai and Oahu.

Simon enters the Amazing Maasai Ultra race, a 75km single-day run that pits international competitors against local Kenyans.

Simon and Turbo enter a two-day paddle race in South Africa.

Simon and Turbo visit Hurricane, Utah, to participate in the 6 Hours in Frog Hollow, a 12.8-mile mountain-biking race winding through gaping canyons and over large boulders.