Four-time Bathurst 1000 winner Greg Murphy admits that he doubted whether he would be quick enough to tackle Mount Panorama in his comeback wildcard outing alongside Richie Stanaway.

Murphy was coaxed out of retirement for a one-off co-drive alongside compatriot Stanaway in an ambitious plan hatched by Boost Mobile founder Peter Adderton.

The story is recounted in the new documentary Wildcard: One Last Shot, now streaming on Kayo.

Getting into the Supercars is only part of the challenge. Keeping yourself there is another story. Just ask Richie Stanaway.

There was a time when the Kiwi had the racing world at his feet.

He was a German Formel Masters and Formula 3 champion, a three-time GP3 race winner, a Monaco GP2 winner and a two-time WEC winner. Three times he finished in the top 10 in class at Le Mans. His sixth Supercars entry was a victory at the Sandown 500 with Cameron Waters, and they could’ve won Bathurst too were it not for a car problem.