Season 1
01. The Bubbler
The Bubbler kidnaps the Shah of Shish-Ka-Bob and it's up to the Impossibles to rescue him.
02. The Shocking Electrical Monster
Dr. Shock uses his Master Mix Monster Machine to turn his assistant Igor into an electricity-absorbing monster.
03. The Spinner
The Spinner steals a $1,000,000 tiara.
04. The Perilous Paper Doll
The Paper Doll Man steals a top secret plan and is out to steal the second part.
05. The Spyder Man
Professor Conroy and Buzz unveil the blueprints for the Spy Detector XK-00-7 at a Maximum Security Building. Unfortunately, the blueprints are targeted by the Spyder Man.
06. Beamatron
Beamatron steals a priceless painting from a ship.
07. The Burrower
The Burrower uses his burrowing machine to steal half a million dollars from the bank and dig ten miles down to his lair.
08. The Menace from the Wax Museum
Upon an encounter with Buzz at the wax museum, Mr. Menace uses his monsters Godzonka, Gorillis and Cyclaws in an attack upon San Francisco.
09. Timeatron
Timeatron uses his time cabinet to bring villains from the past to pillage for him.
10. Smogula
Smogula freezes the Impossibles and seals them within a cave, so they will not interfere with his plans to conquer Empire City.
11. The Alien Brain from Outer Space, Part 1
A giant alien brain arrives on Earth and captures Buzz and Frankenstein Jr.
12. The Sinister Speck
The Speck uses a formula to shrink himself in order to photograph top secret plans.
13. Fero, the Fiendish Fiddler
To get the Impossibles out of the way, Fero uses his fiddle to transport them to different planets.
14. The Alien Brain from Outer Space, Part 2
A giant alien brain arrives on Earth and captures Buzz and Frankenstein Jr.
15. Mother Gruesome
Mother Gruesome invents a machine that brings villainous storybook characters out of their stories to help her with her crimes.
16. Televisatron
Televisatron transports the Impossibles to different television shows.
17. U.F.O. Unidentified Fiendish Object
The alien Zargon unleashes his warrior Destructo to conquer Earth.
18. The Diabolical Dauber
The Dauber uses a special brush where anything he paints becomes real.
19. Aquator
Aquator has stolen a secret formula from a scientist who is friends with Big D and shrinks himself to microscopic size in order to get all the microscopic creatures to become large.
20. The Unearthly Plant Creatures
Plant Man thaws the last three prehistoric plants (the Carnivorous Chewer, the Creeping Crusher and the Fire-Breathing Snapdragon) from a glacier and then sprays them with his Obedience Ray in a plot to eliminate Buzz and Frankenstein Jr.
21. The Wretched Professor Stretch
Professor Stretch causes havoc with his elastic abilities.
22. The Devilish Dragster
The Dragster has stolen a valuable item.
23. The Deadly Living Images
The Mad Inventor has invented the Double Identity Duplicator Projector to create living images he can control.
24. The Return of the Spinner
The Spinner returns and steals a priceless pooch.
25. Satanic Surfer
The Surfer takes pictures of a top secret submarine.
26. The Colossal Junk Monster
The Junk Man creates the Colossal Junk Monster in a plot to eliminate Frankenstein Jr.
27. The Puzzler
No details
28. The Scheming Spraysol
Spraysol steals top secret documents.
29. The Incredible Aqua-Monsters
Buzz and Frankenstein Jr. guard the Navy's new Hydrotomic Submarine to prevent Dr. Hook and his aquatic monsters from stealing it.
30. The Scurrilous Sculptor
The Sculptor turns people into statues.
31. The Artful Archer
The Archer steals a priceless violin and a million dollars.
32. The Gigantic Ghastly Genie
Zorbo the Great creates a genie and plans to use its three wishes in order to defeat Frankenstein Jr. and conquer the world.
33. The Insidious Inflator
The Inflator creates giant balloon monsters to help him commit crimes.
34. The Dastardly Diamond Dazzler
The Diamond Dazzler steals a precious diamond in order to awaken the genie within.
35. The Birdman
Birdman and his robotic birds Vulturo, Rodantus, and King Condor abduct two astronauts and hold them for a ransom of $1,000,000.
36. The Return of the Perilous Paperman
The Paper Doll Man returns and causes trouble.
37. Cronella Critch the Tricky Witch
A witch named Cronella Critch robs a charity for orphans party.
38. The Invasion of the Robot Creatures
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.
39. The Terrible Twister
The Twister is stealing precious jewels.
40. Professor Stretch Bounces Back
Professor Stretch returns and creates a rubber monster to help him.
41. The Manchurian Menace
No details
42. The Terrifying Tapper
The Tapper transmits himself over phone lines.
43. The Anxious Angler
The Angler steals secret space research.
44. The Mad Monster Maker
To perform a crime wave in London, Baron Von Ghoul creates robotic versions of the horror movie monsters the Electroflying Firefly, the Menacing Mummy, and the Wicked Werewolf.
45. The Rascally Ringmaster
The Ringmaster puts on a circus and robs from those who attend.
46. Billy the Kidder
Billy the Kidder is a cowboy who rides a robotic horse and plans to rob the U.S. Mint.
47. The Monstermobile
The Mad Inventor has invented the Monstermobile and uses its many gadgets to commit crimes.
48. The Fiendish Dr. Futuro
Dr. Futuro comes from the 40th century to the twentieth century to steal a million dollar gold brick.
49. The Crafty Clutcher
The Clutcher uses an invention that brings his gloves to life.
50. Pilfering Putty Monster
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.
51. The Infamous Mr. Instant
Mr. Instant uses his insta-gun that can make anything in an instant.
52. The Bizarre Batter
The Batter kidnaps a baseball star and holds him for ransom.
53. The Spooktaculars
Dr. Spectro creates three giant ghoulish ghosts in order to take over Penciltrainia.
54. The Not So Nice Mr. Ice
Mr. Ice and his henchman Freezer Freezer freeze the city in order to take it over.