A Mercedes was doused in a flammable liquid and torched last month, with the fire spreading to another car nearby.
The incident was caught on CCTV and police have now released the footage in an appeal to help catch the culprit.
Officers were called to reports of a car fire in High Street, Woodville, at 8.15pm on February 19.
A spokesperson for Derbyshire Constabulary said: “At the scene a Mercedes and an Audi were found to have been badly damaged. CCTV viewed by officers captured the moment that the offender, who is believed to have been riding a motorcycle, set the Mercedes alight, with the fire then spreading to the Audi.
“Investigations are ongoing into the incident and officers are keen to speak to anyone who has any information that can assist with their enquiries.”
Anyone with any information should contact Derbyshire police, including reference 22*101365.