I had my own "Bad Film Festival" over the weekend after picking several DVDs up at Big Lots:

Gamera the Invincible from 1965. The first non-Toho "Giant Monster Played by a Man in a Rubber Suit" movie, it posits that an accidental Nuclear brush-up between American & Russian Cold Warriors at the North Pole results in the release of a 200 Million Year Old Ur-Turtle from an icy prison. The Turtle then decides Japan is full of the Heat & Light Energy that he needs to survive, and attacks Tokyo.

War of the Monsters: Gamera vs. Barugon. a trio of greedy Treasure Hunters steal a sacred (but cursed) "Gem" from islanders. One of the three betrays the other 2 & leaves them for dead, only to lose the "Gem" off shore upon arriving back in Tokyo. The "Gem" hatches into a Frost-Breathed, Rainbow-Colored Energy-Ray Spewing, Giant Chamelian (that looks mysteriously like Toho's Baragon, but with much better powers), and only Gamera can stop him! But Gamera cannot face Barugon's Frost Breath, he's allergic to cold! Oh No! Can the scientists stop Barugon, or will Gamera overcome his problems with cold?

Destroy All Planets. AIP had a hit with Toho's Destroy All Monsters, so Gamera get's a related name. It's Gamers vs. the Ring of Giant Beachballs as our favorite Giant Turtle is morally paralyzed by Aliens bent on World Conquest with the simple expedient of kidnapping 2 Boy Scouts & threatening to hurt them. Gamera allows himself to be injected with a neck-mounted remote control mind control device which forces him to attack Tokyo against his will, but the wiley & resourceful Boy Scouts slip their bounds and reverse the positive & negative poles on the Aliens' batteries to free Gamera & themselves. Gamera can then destroy their patheticaly underarmored Giant Beachballs and fight their Giant Squid Alien Leader!

Challenge of the Masters. Kung Fu Masters' deadly fights for prestige via local Firecracker Festivals & Lion Dancers descends into chaos as assassins & Bandit Kings in Hiding drive a young man to learn Kung Fu & prove himself worthy of his Father's teacher.

Flash Gordon Conquers the Universe, all 12 Episodes! A bizare plague, the Purple Death (which kills instantly & who's only mark is a purple smudge on the victim's forehead), is ravaging Earth and it's up to Flash, Dale & Dr. Zarkov to find who's responsible. A quick trip in Zarkov's spaceship shows our heroes one of Ming's spaceships feeding a near invisible dust into our atmosphere, and follow it home to find the cure, have adventures, and overthrow Ming, the Merciless (again), freeing the Rock People & saving their Prince, defeating the "Walking Bombs," and saving Princess Aura, Dale, Dr. Zarkov, and various other friends, from horrible deaths at the hands of Ming, the Merciless (again)!