Apple TV Plus Tuesday rolled out the latest trailer for its upcoming unscripted original series, Long Way Up, starring Ewan McGregor and Charley Boorman.

The series, which debuts on the streaming service Sept. 18, follows the two best friends as they journey more than 13,000 miles over 100 days from South America to Los Angeles on prototype electric Harley-Davidson motorcycles, the service said. 

Long Way Up is executive produced by McGregor, Boorman, David Alexanian and Russ Malkin. 

(UPDATED) Discovery Channel will air a documentary film exposing the hidden world of endangered species and a new scripted series on the history of Harley-Davidson as part of its 2015-16 programming slate, the network announced Tuesday morning during Discovery Communications’ upfront presentation.

The documentary, Race Extinction, follows a team of artists and activists as they seek to chronicle endangered species and the race to protect them against mass extinction. The film will serve as the launch of a larger, ongoing campaign to reduce carbon emissions and the prevention of species extinction, said network executives.

Discovery will develop its second scripted series, Harley-Davidson, based on the lives of William S. Harley and Arthur Davidson and their creation of the motorcycle brand that has shaped the cultural landscape, said the network.

 Other new unscripted series and specials include Naked And Afraid XL, a spinoff special of the network’s popular competition series; Treasure Quest, a series that follows several explorers searching for Icon gold know and the Treasure Of the Trinity stolen in 1524; Pacific Warriors, which chronicles Hawaiian men and women who fish using only a kayak and a paddle; Lunar XPrize, a space exploration/competition series pitting teams looking to land a robot on the moon; Killing Fields, which uses the most up to date science advancements and technologies to uncover crimes that have gone undetected due to their geography; and Cuban Chrome, which follows Cuban car enthusiasts who restore classic American cars.