'Grey's Anatomy' Star Patrick Dempsey Rushes to Save Car Crash Victim

4/27/2012 12:07 PM PDT

Have no fear ... McDreamy is here ... "Grey's Anatomy" star Patrick Dempsey came to the rescue of a teenage driver, who crashed and flipped his car in Malibu this week ... TMZ has learned.

The accident occurred Tuesday at around 5pm, right next to Dempsey's Malibu pad. A young driver lost control of his Mustang and it overturned repeatedly, crashing into the actor's front yard. We're told the car was TOTALED.

Responding with lightning speed ... McDreamy ran to the wrecked car -- we're told with crowbar in hand -- so he could pry the driver from the vehicle. We're told Patrick was able to get the boy out of the car.

911 was called and police came. The teenager got a concussion -- but miraculously, there were no serious injuries.