The term 'Thunderbolt Thrower' refers to two characters from Greek mythology, Thor and Zeus. Thor is the Norse god of thunder and lightning, and he is often depicted throwing a hammer or a lightning bolt. Zeus is the king of the gods in Greek mythology, and he is often depicted throwing a lightning bolt. Both characters are associated with the power of thunder and lightning, and thus the term 'Thunderbolt Thrower' is used to refer to them.