Each time you beat a race on the lighting challenge, you will unlock 2 drivers as thunder plates. The first driver will be Richard Petty, then you will unlock up to 23 Busch series cars plus other legends. Besides Petty there is Beny Parsons, Bobby Allison, Alan Kawicki, Tiny Lund, Elmo Langly, Junior Johnson, Cale Yarborough. Dale Earnhardt will also be one of the legends but he can be unlocked automatically by typing in his name.