The 'Two and a Half Men' star came to the aid of a group of hikers after their car's battery died, reported TMZ online.
The group was stunned when the 36-year-old actor spotted them and pulled over, offering to help, the driver said.
Ashton told them that he had to drop his passenger, believed to have been his fiance Mila Kunis at home first, but quickly returned to the scene to assist them.
The heartthrob initially struggled to find his own battery, because it was located in the back of his Lexus, but eventually helped them get back on the road. A member of the group captured a video of the road-side rescue.