Consider this an alternate ending to Homer Goes to College. Mr. Burns shows up at the Simpson house and gives Homer an ultimatum, either pass Nuclear Physics 101 or get fired. Homer takes the course and fails the final exam. Not wanting to lose his job, he and some nerds hack into the system to change his grade, unaware of what will come next. Homer returns to work. Homer then causes the plant to have a melt down. Unqualified, Homer doesn't know what to do, and takes a stab at a miracle. He blows up the entire town.