Dragonzamasu
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Dragonzamasu is the second boss of the game Super Mario Land. He is seahorse-like dragon that lives underwater. During the extraterrestrial invasion of Sarasaland, the evil space alien Tatanga placed Dragonzamasu in charge of the Muda Kingdom, the second world of Sarasaland. In the third level of this world, Mario battled Dragonzamasu in the monster’s water-filled lair. However, since they were underwater, Mario fought Dragonzamasu with his custom submarine, the Sea Pop. To defeat Dragonzamasu, Mario had to fire torpedoes at the monster. However, Dragonzamasu was protected by bubble barriers named Tamao. Thus Mario had to fire torpedoes in between the barriers to damage Dragonzamasu. After twenty torpedo hits, Mario defeated the monstrous Dragonzamasu and liberated the Muda Kingdom.
Interestingly enough, the Dragonzamasu fight is the first shooter battle in any Mario game.