You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: FOREIGN FILMS 
Clue: This hero of 3 Satyajit Ray films shares his name with the Kwik-E-Mart proprietor on "The Simpsons"
apu

Category: MYTHOLOGY 
Clue: This Norse god known for his great strength was a protector of peasants & farmers
thor

Category: DOUBLE Ws 
Clue: This Mills Brothers song standard says, "Light up you little ol' bug of lightnin'"

"glow worm"