Italia 90 was, in a sense, the first and the last World Cup. It was also the best and worst World Cup. It was football stood at a junction. It was the World Cup of Gazza's tears and Nessun Dorma, a grand spectacle of colour and drama that made football suddenly fashionable again - at least among the wider English public (and salivating television executives). Yet it was also a World Cup low on goals and high on fouls which led to the re-writing of football's rulebook.
Chaos is a Friend of Mine tells McGregor's journey to becoming one of the most controversial sports stars of the 21st century, loved and loathed in equal measure, a divisive figure who, by 2018, was a multi-millionaire champion shacked up in Las Vegas and waiting for his latest superfight.