Harry Styles, Zayn Malik, Louis Tomlinson, Liam Payne and Niall Horan were five complete strangers when they auditioned as solo acts on The X Factor and ended up being thrown together to create one of the world's biggest bands.
The brain child of Simon Cowell, One Direction was the juggernaut that nobody saw coming. But with their chemistry and laddish banter, it was hard not to get drawn into the 1D mania.
But just as they were at the top of their game, tragedy struck when Zayn famously quit in 2015 after five gruelling years on the road.
