Tom Hardy was reportedly seen apprehending a suspected moped thief after chasing him through gardens and a building site before performing a citizen's arrest.
An onlooker said the 39-year-old Revenant star looked like he "switched into superhero mode" as he collared the man before checking him for weapons after the chase near his home in Richmond, south west London, according to The Sun.
With Hardy's help, two suspects were detained in connection with the theft, the newspaper said.
The witness said two males had jumped a red light at a busy junction before crashing into a car.
"Tom must have been walking down the road. He went off like a shot in pursuit and looked furious," 22-year-old Arun Pullen said.
He added: "I asked Tom what happened and he told me he chased him through my back garden and caught him around the block - but the route was like an assault course."
Hardy reportedly performed a citizen's arrest on the fleeing suspect.
Pullen's girlfriend, Kalisha, a fan of the actor, told the newspaper: "There was no mistaking him."
Hardy has yet to comment on the report.
