Samekujira
A natural creature from the ocean Samekujira remained in deep waters until a tanker got its attention for entering his territory. A day later Samekujira was somehow lead to Japan and arose from Tokyo Bay. ZAT and Ultraman Taroh soon came to the scene, but they were also met with a fisherman from outer space named Valkie Seijin. Valkie got in the way of Taroh as Samekujira was gliding to impale his head blade into his enemies, but the Ultra soon managed to chase the alien off and destroyed Samekujira with the Storium Beam. The destruction of Samekujira also brought an end to the third age of monsters and with Valkie's appearance started the third age of aliens.
Read more about this topic: List Of Ultraman Taro Monsters