STARK 4 is the number plate used in the first Iron Man film by Tony Stark. Tony, played by Robert Downey Jr., has quite the car collection, all with the number plate “STARK X”.

STARK 4 featured in the 2008 Iron Man on an Audi R8 and was replaced by the Audi R8 Spyder model in Iron Man 2 with a STARK 11 plate.