Mystery surrounds a bizarre incident where a pedestrian was hit by a car, then crawled into the vehicle that mowed him down.

CCTV of the accident shows what appears to be a Toyota Corolla with no registration plates colliding with a man walking along Canterbury Road in Kilsyth, in Melbourne's east, on Wednesday.

The man is sent soaring through the air, landing on an adjacent nature strip.

What happened next has police baffled.

He can then be seen crawling back over to the car, opening the passenger door and getting in, before the car drives off.

CCTV shows a white car crashing into a man. (9NEWS)

The injured man crawls into the vehicle. (9NEWS)

"That vehicle then stopped and the pedestrian crawled on his hands and knees to the passenger side of that vehicle and got in and they both drove away," Sergeant Lee Nichols said today.

Police say they suspect both the driver and the victim knew one another.

The incident was reported by a witness but the car did not have any visible number plates.

Police don't believe it was a deliberate act but have slammed the actions of the driver.

"Ridiculous driving, dangerous driving. No regard for the safety of the public," Sgt Nichols said.

Police are yet to receive a formal complaint from the victim, who has also failed to seek medical treatment at any of the nearby hospitals.

"My advice to you would be to go to a hospital. You never know what other injuries you may have going on inside you," Sgt Nichols said.

They have appealed for anyone with information about the car involved or the identities of the driver or victim to come forward.