A Good Samaritan couple have had their car stolen by a man they tried to help from a car wreck in Melbourne's northern fringe overnight.

Samantha Petrevski and Daniel Sperandio were driving on Donnybrook Road in Donnybrook just after 9pm yesterday when they came across a car that had mounted a road barrier and rolled.

The couple pulled over to help the occupant of the car, who was seen on CCTV stumbling out of the boot, surrounded by a group of people who had also stopped to help.

The occupant of the crashed car then slipped away from the scene and jumped into the couple's Holden and drove away.

"All of a sudden, we're trying to move everyone away from this car to wait for emergency services, and someone screams out 'whose red car is that? He's getting in it'," Petrevski said.

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