A.J. and his classmates meet their new science teacher, Mr. Docker. who teaches them all about the scientific method, and how to use it when doing experiments. Mr. Docker, who likes potatoes makes a potato powered car, that really works and calls it the spud mobile, this changes A.J. outlook that science is only for nerds. Andrea reveals to the entire class what A.J. stands for as this adventure comes to an end at Ella Mentry School.