When Heroes Become Legends is a feature documentary that tells the story of the 2017 / 2018 Legends Slam series of Ultratrail races in Belgium and Luxembourg.

With a total of 730km and 15.000m of vertical gain over just four races achieving the Legends Slam challenges the physical and mental abilities of the atletes that are brave enough to embark on this adventure.

When Heroes Become Legends follows 5 runners who attempt to complete the first edition of the Legends Slam series. Their challenge consists of the 160 kilometer Great Escape from Luxembourg to the Belgian Ardennes, the 160 kilometer Bello Gallico in the Flanders area of Belgium, the 250 kilometer winter race, The Legends Trail and the last man standing concept of Another One Bites The Dust during the hottest days of the year.

Follow these heroes during their challenges to complete these races, experience their struggles, their achievements and their emotions on their way to become Legends!