Brad Keselowski -- 'Sharknado 3' Going to His Head ... Oh Hell No!! (VIDEO)

Brad Keselowski's played the role of NASCAR champion, and even NASCAR villain -- but his greatest role yet will be ... shark food.

Yes, the former Sprint Cup champ's got a meaty role in tonight's premiere of "Sharknado 3" ... and he's very proud of the work he put into what he calls, "a story that had to be told."

BK gave his fans a behind the scenes look with this video -- and even got co-star Ian Ziering and famed Thespian David Spade to co-sign on his performance. It's pretty hysterical.

And watch for the scene stealer in this clip ... Brad's teammate Joey Logano.