Gamera

Gamera, the Giant Monster (1965)
A nuclear explosion in the far north unleashes Gamera, the legendary flying turtle, from his sleep under the ice. In his search for energy, Gamera wreaks havoc over the entire world, and it's up to the scientists, assisted by a young boy with a strange sympathic link to the monster, to put a stop to Gamera's rampage.

Gamera vs. Barugon (1966)
Gamera escapes from his rocket enclosure and makes his way back to Earth as a giant opal from New Guinea is brought back to Japan. The opal is discovered to have been an egg that births a new monster called Barugon. The creature attacks the city of Osaka by emitting a destructive rainbow ray from his back, along with a freezing spray capable of incapacitating Gamera.

Gamera 3: Revenge of Iris (1999)
With the Gyaos re-emerging, Gamera's ties to humanity have been severed with his bond to Asagi broken. Nagamine and Asagi investigate while an orphaned girl named Ayana discovers a new creature she names Iris. Nagamine and Asagi must reach Ayana before she takes her revenge on Gamera, who she blames for the death of her family.

Gamera 2: Attack of the Legion (1996)
A strange meteor lands in Japan and unleashes hundreds of insect-like "Legion" creatures bent on colonizing the Earth. When the military fails to control the situation, Gamera shows up to deal with the ever-evolving space adversary. However the battle may result in Gamera losing his bond with both Asagi and humanity.

Gamera vs. Viras (1968)
As alien invaders plot to conquer the Earth, two Boy Scouts steal a mini-submarine and discover Gamera in their midst. Transported to the alien's spaceship, the Scouts are menaced by the evil inhabitants, including Viras, a squid-like monster that grows to colossal size to battle Gamera.

Gamera vs. Guiron (1969)
Two young boys sneak aboard a spaceship and find themselves whisked away to the mysterious planet Terra. There, they encounter Gamera's old foe Gyaos and two female aliens with a taste for human brains. Gamera must save the children and battle the new monster Guiron, whose entire body is a deadly living weapon.

Gamera vs. Zigra (1971)
A moon base is destroyed by a spaceship with a cluster of gumballs on its head. Later, at Sea World, dolphins are dying mysteriously. Zigra kidnaps two men and two children (one of whom is a Coke addict - Coca-Cola that is) and starts causing earthquakes. The two six year olds somehow outwit Zigra and help their incapacitated fathers escape. The Zigra Woman, who can use her eyes to put people into comas, then chases them all over Sea World like an extended Benny Hill skit. Somewhere in this movie Gamera finally shows up, fights Zigra, who turns into a giant swordfish.

Gamera: Guardian of the Universe (1995)
A ship runs aground on a mysterious atoll leading to an investigation by insurance representative Kusanagi, who discovers an ancient bead that he gives to his daughter Asagi. Meanwhile, ornithologist Nagamine investigates reports of a new species of large bird named Gyaos. As the Gyaos begin to attack, an ancient guardian with a bond to Asagi emerges.