Thieves have stolen footage for an upcoming footy documentary from homegrown Hollywood star Eric Bana and former AFL player Koby Stevens in Melbourne.

Stevens found the window of his car smashed in St Kilda this morning, with the thieves taking camera gear and a hard drive with hours of interviews for the new project.

“You’d look at the hard drive and you probably wouldn’t know what’s on it,” he said.

“There’s stuff on there about stories no-one’s ever seen and stuff on there they were only willing to tell to us.”

It is those stories on a large black and silver hard drive – that were stolen along with tens of thousands of dollars of camera gear – that Stevens hopes will give hope to others living with head injuries after concussions ended his AFL career.

“Doctors, athletes who were going on their own healing journeys. Myself and Eric Bana have been shooting that story for the last five years,” Stevens said.

When he finished with St Kilda, head knocks meant Stevens couldn’t get out of bed. 

But today as he was about to head off on a shoot, he had just gone upstairs, returning to find the smashed glass in St Kilda. 

“You wouldn’t think something like that would happen so quick,” Stevens said.

Despite multiple CCTV cameras on the street, police believe they may have missed the actual theft.

All Stevens wants is the hard drive back.

“If anyone comes across it, I don’t even care about the camera equipment, just drop the hard drive off,” he said.

The film Thrive is due to enter post-production at the end of the year. 

“The film’s pretty game-changing and on that hard drive was some pretty game-changing stuff,” Stevens said.

“It’s just the sensitive nature of it all, that’s now floating around in Melbourne somewhere.”