In 2016, Nick Butter was searching for a way to raise £250,000 for a prostate cancer charity. He knew he wanted to undertake some kind of running challenge, but wasn't sure what - until he discovered nobody had ever run a marathon in every country in the world. Two years later, he headed to Canada to embark on an epic journey, not realising just how challenging it would be. On his travels, he would be shot at, mugged at gunpoint and attacked by dogs, in addition to pushing his body far beyond anything he'd ever endured. But did he reach the finish line?

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