Dr. Shock uses his Master Mix Monster Machine to turn his assistant Igor into an electricity-absorbing monster.

Upon an encounter with Buzz at the wax museum, Mr. Menace uses his monsters Gadzonka, Gorillis, and Cyclaws in an attack upon San Francisco.

A giant alien brain arrives on Earth and captures Buzz and Professor Conroy.

A giant alien brain arrives on Earth and captures Buzz and Professor Conroy, cont...

Unidentified Fiendish Object The alien Zargon unleashes his warrior Destructo in his plans to conquer Earth.

Plant Man thaws the last three prehistoric plant creatures (consisting of Carnivorous Chewer, Creeping Crusher, and Fire-Breathing Snapdragon) from a glacier and then sprays them with his Obedience Ray in a plot to eliminate Buzz and Frankenstein Jr.

Living Images The Mad Inventor has invented the Double Identity Duplicator Projector to make copies of whatever pictures he inserts in it.

Junk Man creates the Colossal Junk Monster in a plot to eliminate Frankenstein Jr.

Buzz and Frankenstein Jr. guard the Navy's new Hydrotomic Submarine to prevent Dr. Hook and his aquatic monsters from stealing it.

Zorbo the Great creates a genie and plans to use its three wishes in order to defeat Frankenstein Jr. and conquer the world.

Birdman and his robotic birds Vulturo, Rodantus, and King Condor abduct two astronauts and holds them for a ransom of $1,000,000.

Sertano the Satellite King, an alien from Galaxy X, uses a gravity ray in order to get Earth to surrender. Buzz and Frankenstein Jr. must defeat Sertano's robots in order to defeat him.

Manchurian Menace steals a space camera capsule that has just returned with photos from Mars.

To perform a crime wave in London, Baron Von Ghoul creates robotic versions of horror movie monsters Electroflying Firefly, Menacing Mummy and the Wicked Werewolf.

The Mad Inventor has invented the Monstermobile and uses its many gadgets to commit crimes.

Mr. Menace uses his putty monster to steal a $1,000,000 coin collection and even kidnaps Buzz. It is up to Frankenstein Jr. to rescue Buzz and defeat Mr. Menace.

Dr. Spectro creates three giant ghoulish ghosts in order to take over Penciltrainia.