Godzilla Vs. Bagan is a kaiju film starring Godzilla, M.O.G.U.E.R.A., Jet Jaguar, and Bagan.
When a "bottomless pit" is discovered in Osaka, scientists are skeptical. One scientist investigating the bottomless pit accidentally falls in. Months later, the same scientist emerges from the pit, and tells his fellow scientists that it's not a bottomless pit.... it's a portal to another dimension. An American scientist, Joshua Radden, recommends that they send in a research team. The research team enters the portal, and discovers that the dimension they are in is full of kaiju. The research team is chased out of the dimension by several kaiju. Later, in our dimension, an earthquake awakens Godzilla, who goes on a rampage through New York. Meanwhile, scientists discover that the earthquake was caused by an erruption coming through the portal. Suddenly, a giant monster (Bagan) emerges from the portal. It goes on a rampage through Osaka. The government sends in a robot, Jet Jaguar, to defeat the monster. However, Jet Jaguar is defeated after Bagan tears off his arms and legs. Meanwhile, in New York, Godzilla is attacked by goverment aircrafts. The aircrafts shoot missiles at him, but their attacks are nothing compared to Godzilla's mighty atomic breath. Godzilla takes out the planes, when suddenly, the government sends in M.O.G.U.E.R.A. to stop him. Godzilla defeats M.O.G.U.E.R.A. after ripping his head and torso off. Godzilla leaves into the ocean, and, underwater, is attacked by several submarines. The submarines shoot torpedos at him, but Godzilla manages to destroy the submarines. Meanwhile, in Osaka, Bagan leaves into the ocean, too. Later, Godzilla and Bagan cross paths for the first time. Bagan shoots Godzilla with his laser vision. Godzilla, in retaliation, sends Bagan flying out of the water with his atomic breath. Bagan lands on Hawaii. Godzilla jumps out of the water and continues fighting Bagan. Meanwhile, scientists rebuild M.O.G.U.E.R.A and Jet Jaguar. They give M.O.G.U.E.R.A Jet Jaguar's head and torso, creating J.A.G.U.E.R.A.