Dr. Seiji Shimada

Seiji Shimada is an oceanographer and a main character in the 2009 Asylum film Mega Shark Versus Giant Octopus. He is portrayed by Vic Chao

Mega Shark Versus Giant Octopus (2009)
After the Kobayashi Subsea Drilling Platform was destroyed by a Giant Octopus, Seiji went to the Tokyo Federal Detention Facility to interview the lone survivor. Seeking help with the identification of the perpetrator, Seiji called Professor Lamar Sanders, whom he met at the San Francisco Airport. Shimada sought their help in identifying the creature attacking Japan, and just after they realized there had to have been more than one creature, Lamar's colleague Emma MacNeil relieved a package with footage from a minisub voyage she had taken near Alaska showing a Megalodon and Giant Octopus emerging from the ice. The next morning, Lamar's home was invaded by the military, and the three were taken to the Treasure Island U.S. Naval command station, where they informed the military that there were two monsters, an octopus in addition to the shark. Seiji and Emma then made it clear that the beasts were to be captured and not killed. Lamar and Seiji had already determined that their ideal capture points were the shelves of Tokyo Bay and San Francisco Bay. After nights of fruitless work on trying to design a lure for the monsters, Seiji and Emma began to talk about their love of the ocean and their deep seated connections to it. This lead to them kissing and having sex, which gave them the breakthrough of using pheromones to attract the monsters to the bays. They developed canisters of pheromone goo to make a trail for the monsters to follow into the bay. They then parted ways, and Seiji returned to Japan to help to lure the Octopus into Tokyo Bay, which unfortunately failed and the creature escaped.

Emma then deduced that the way to win was to get the monsters to fight one another, and using the pheromone lures, they attempted to lure them to each other. Seiji, aboard the Japanese Lead Sub Typhoon, which he ordered to follow the beasts to wherever they were going when one broke away. They emerged just in time to save the American sub from the jaws of Mega Shark, but the submarine was attacked and disabled by the Giant Octopus. They began to sink, but made contact with Emma and Lamar in the Aquanaut 3 as the wounded monsters sank to the bottom of the sea.

Back on the shore, Emma and Seiji sat on the beach to reflect on their day and their adventures, when Lamar approached with infrared images of an unidentified creature in the North Sea, and they all left to investigate it.