 Feeling inadequate as a father, Homer helps Bart get involved in the soap box derby with a flimsy car, especially compared to the ones used by Nelson Muntz and Martin Prince. When Martin is injured from a race(despite winning), Bart is so impressed that he visit s him in the hospital, where Martin urges him to take his superior car and use it to defeat Nelson, even though he knows it ll cause a rift between him and his father.