Stephen Evans, 18, from Holywell, appeared before Flintshire magistrates on Monday.
It is alleged he intended to put life in danger, or was reckless as to whether life would be endangered, amid allegations the cars were close to people's homes.
He was remanded in custody.
Magistrates said the case should be sent to Mold Crown Court where he will appear at a preliminary hearing on Friday 11 September.
A man has been charged with 12 counts of arson after a dozen vehicles were allegedly torched in Holywell, Flintshire.