Underdog rescues a boy locked in a bank vault, causing destructive mayhem in the process; An army of huge mechanical monsters invades the city and capture Polly Purebred; Simon Bar-Sinister develops an energy ray that turns its target into a photograph. He kidnaps Sweet Polly Purebred to trap Underdog into a photograph and tear him up; The Indian Gophers plan to send the colonel to the moon in a rocket; Commander McBragg tells how he untrailed a group of savages
Simon invents a snow machine. He turns people into snow. Can Underdog stop him before it's to late?; Simon Bar-Sinister engages in a robbery spree throughout the city, turning people into snowmen. Meanwhile, Sweet Polly Purebred discovers Simon's laboratory; The Indian Gophers deliver a gift of a totem pole to the fort, but they hide inside and conduct raids at night; Commander McBragg tells about a giant fish
Simon forces Sweet Polly Purebred to broadcast an ultimatum to the city. When Underdog comes to save the day, Simon uses his snow ray on him; Underdog has been frozen by Simon's snow ray, and Simon holds the city in terror; General Nuisance visits the fort and threatens to transfer the Colonel because of his failure to capture the Indian Gophers; Commander McBragg tells about his encounter with Abominable Snowmen
King Klobber, from the distant planet of Zot, has promised his daughter, Princess Glissando, the strongest husband in the universe; King Klobber sends a delegation to earth to bring back Underdog to marry his daughter, against Underdog's wishes; The colonel obtains a Gatling gun which he plans to use against the Indian Gophers; Commander McBragg tells his North Pole tale
Underdog successfully fights off the Zot army, so King Klobber kidnaps Sweet Polly Purebred; To save Sweet Polly, Underdog agrees to marry Princess Glissando. The wedding is threatened by a two-headed dragon; The colonel convinces the Indian Gophers to move to Cleveland
Riff-Raff is no longer Public Enemy No. 1, so he comes up with the ultimate plan: robbing a trainload of gold; Riff-Raff's plan goes into action; The Gophers give the Colonel a headache and a stomachache as part of their scheme to steal his bologna; Commander McBragg recalls when he took down five enemy planes
Underdog is still confused and frustrated trying to find Sweet Polly among all the balloon; The train full of gold is about to crash into another train, with Riff-Raff's plan going just as he expected; The Colonel leads an assault on the Gophers' secret hideout atop Lonesome Mesa - unaware that the mesa is a Gopher construct laden with traps; Commander McBragg tells a tale that happened at Niagara Falls
Sweet Polly Squeeze boards a ship to travel to a south sea island to investigate the world's biggest monster "Fearo the Ferocious"; After overcoming a mutiny at sea Polly and the gang continue on to the south sea Island to find "Fearo the Ferocious"; The Gophers send a trained Indian termite to attack the Colonel's wooden fort; Commander McBragg tells about when he "cleaned" Dodge City
Reminiscent of the movie King Kong the gang captures "Fearo" and return him to civilization to meet the public in a big television broadcast; "Fearo" runs amok and even the Army cannot stop him. Underdog arrives on the scene and battles "Fearo" by tantalizing him with a jungle delicacy; Upon learning that the Colonel plans to bring them down using football tactics, the Gophers carve football tackling dummies in their own likenesses; Commander McBragg remembers his football game with Hex University
Simon Bar Sinister is working an a chemical that will shrink the city's citizens to miniature size; After being shrunk by Simon Bar-Sinister Underdog and Polly are imprisoned in a birdcage in Simon's lair; General Nuisance sets up a telegraph line to send attack orders to the Colonel. The Gophers tap the line and send to the Colonel - shall we say - revised orders; Commander McBragg recalls getting away with a stolen record
The shrunken Underdog and Polly make their way through Simon's garden to try and stop Simon's plans, facing rats and eagle attacks; Simon shrinks the inhabitants of the city, as well as his henchman so he can be the tallest man in the world and then lies down for a rest; The Colonel and the Sergeant prospect for gold in Gopher Gulch, hoping that a gold strike will draw thousands of fortune seekers, crowding out Ruffled Feather and Running Board; Commander McBragg tells about an encounter with a black snake
Underdog is enlisted to protect the Excalibur Sword Collection from RiffRaff
Simon Bar-Sinister uses a Time Bomb to travel back in time to stop the first Thanksgiving
Polly tells Overcat about Underdog but he is not worried; he kidnaps her to milk the cows. Polly calls for Underdog. When he gets to Overcat's planet, he is placed in a rubber ball trap that drains his energy. He is taken to help Polly milk the cows.
The planet Felina's milk wells have run dry which makes the evil ruler Overcat mad. He and his men go to Earth and steal all the cows. However, they don't know how to get the milk from them so they grab someone who does... Sweet Polly!
Polly gives Underdog his energy pill and he beats Overcat's men. Next, Underdog takes Polly and the cows back to earth. Overcat challenges Underdog to a fight for the cows. If Underdog refuses, Overcat will attack Earth.
At first it look like Overcat is going to win. But even though he's as strong as Underdog, he's not fast. Underdog uses his speed to beat Overcat. When the cats kick Overcat out of Felina, Underdog gives them coconut trees so they never run out of milk.
Sinister and Cad invent another evil device they call the Big Dipper, a machine that can dry up all of the world's water supplies. On its first trials, the Big Dipper does little more than flooding Simon's lab. After a few false starts, the Big Dipper is finally ready to destroy the world's water supply and Simon may finally have a means of taking over the world!
Simon and Cad have invented a device to drain off the world's water supply. The pair travels around the world and steal all of the world's water. When Simon steals the Atlantic Ocean, he leaves Underdog stuck in the polluted mud of what was once the Atlantic Ocean.
Simon has finally forced the people of the city and the world to give him ultimate power. Underdog is still stuck in the polluted mud of what was once the Atlantic Ocean. He swallows a super energy pill from his ring and, regaining his super powers, he flies back to the city and tricks the two villains into giving him all of Simon's jars of water. In retaliation, Simon prepares to destroy the Big Dipper with his pistol. Our hero takes the gun away from Simon and knocks the two villains out. Underdog refills the world's entire waterway, saving the world once again.
Simon and Cad have drained the Atlantic Ocean and they've defeated Underdog. They return to the USA where the people are demanding their water back. But Simon says, "Unless You do as Simon says, you'll get no water!" Polly finds it hard to believe that all of the world's waters are in little jars held by Simon. Seeing that the world needs a further demonstration of his machine's awesome power over them, Simon takes out a jar that contains what was once his swimming pool and places it into his machine. He turns it on and fresh clean waters come from the Big Dipper's hose, filling Simon's pool. The people of the world begin to do what Simon Says and it seems as if the mad scientist has won!
The prison warden's chief officer informs him that Riff Raff is assembling a gang and is planning on escaping. They feel that they need to tell Underdog, so they send for Sweet Polly to call for him. When Polly arrives, the chief officer explains what was overheard in the prison from some of the prisoners that Riff has obtained as part of his gang. Polly then calls for Underdog, who, disguised as shoeshine boy, is stalled waiting for a woman to exit the phone booth he needs to change in. Upon hearing that Underdog has been called, Riff makes the decision that his newly formed gang needs to leave immediately, taking with them a disguised little fella. When the gang asks why he needs to be taken along, Riff responds, 'Just in Case.'
Riff and his gang decide to rob one more vessel before they go for their biggest catch, The Queen May. But, Polly has hidden herself as a decoy so that she can call for Underdog once she is on board the Ghost Ship. When the gang opens the contents of the merchant ship they just robbed, Polly emerges and runs calling for Underdog. They capture her but the gang is fearful that her cries will bring Underdog. At this point, Riff finally reveals what 'Just in Case' is,...Just in Case Underdog comes! The disguised fella is really a witch doctor who, along with a voodoo doll in the form of Underdog, is able to manipulate our hero and leave him helpless
A strange object crash-lands on earth. A group of scientists check out the mysterious object, determining that it's a harmless, dead comet. The scientists leave the scene unaware of the fact that a secret door opens from the center of this strange thing and two evil looking space aliens emerge from this strange object.
In this final episode, Shoeshine asks for a drink of water after being placed in his cell. When he gets it from the guard he tosses it into the guards eyes. The next phase of their plan is to get the Granite Gun which is in the throne room of Captain Marblehead who is enjoying his meal. Polly attempts to clobber the Captain with a pipe, but it has no effect on his stone head. He then calls for the guards who round up the prisoners. In the confusion, the guards hurl a projectile at the prisoners who duck and allows it to break open a wall to reveal a phone booth. Shoeshine sees this opportunity and changes into Underdog. He races to free the prisoners only to face Captain Marblehead and the Granite Gun. Underdog gets temporarily made of stone but then breaks free. He then melts the Granite Gun with his x-ray vision. After defeating Captain Marblehead, he tells him to mine his own rocks in the quarry and then heads home and frees all those who were turned to stone.
Simon invents the Valentine Vault which turns people into paper valentines. He orders Cad and his two henchmen to kidnap Sweet Polly... to set a trap to catch Underdog in the machine.
Shoeshine Boy finally transforms into Underdog. He frees Polly, but she faints before warning him about the Valentine machine. Underdog charges in but is crushed flat and turned into to a paper valentine. Then Simon tells Cad and the henchmen to load the machine in to a truck to take it to City Hall to turn the Mayor into a paper valentine. Before they go, they re-handcuff Polly to the pole so when she comes to she can look at her beloved hero
Sweet Polly is reporting a launch in space but the capsule is pulled off course to an uncharted planet. On this planet, the evil Zorb used a magnet to pull the capsule to his planet. Zorb explains to his henchman, Cron, his plan to use the capsule as a decoy to lure Underdog. The capsule lands on the planet and gets stuck in the mud. A call is made to Underdog to rescue the planet. After freeing the ship, Cron approaches with a charm and puts it around Underdog as a gift. Underdog, thinking he is a friend suggests to bring Cron back to Earth.
In the final episode, the giant finishes toying with Underdog and bats him back to the hospital. With Underdog out of the picture, the Army, Navy and Air Force is called into action against the giant. The giant conquers all the armed forces. Polly explains to Underdog that they were all defeated. Hearing this, Underdog tries to leave, but Polly grabs him by the charm around his neck. In the tug-of-war the charm breaks and Underdog is no longer dizzy. Underdog faces the giant and then punches him so hard, he lands back to his home planet.
After a violent thunderstorm ravages the city, the community gathers in front of one of the steel buildings to see a message revealed inscribed on its side: 'To Underdog, A Rhyme in Time Saves Nine'. Sweet Polly asks Flim Flannigan at the police station what it means. Flim explains it could only be the work of Slippery Eel. A few weeks earlier, Eel, Fish, and their henchmen attempted to rob an armored car. They were caught by Underdog and were sent to the maximum prison with the electric fence. Still determined to get out, Slippery Eel tells his boys that he is going to climb the fence now that the power didn't seem to be on. Midway climbing the fence, the guards see him trying to escape and turn on the electricity. However, instead of electrocuting him, it electrifies him, and he then claims that he is now 'The Electric Eel'. He shoots bursts of electricity at the fence and wall and escapes with Fish and the gang, all the while vowing to get even with Underdog.
The Electric Eel traps Underdog in his electric cage. As the cage closes in around him, the cage fills Underdog's body with thousands of volts. Before he dies, Underdog asks the villains not to throw him into the city's lake. Underdog's body is soon limp at the bottom of the electric cage. Sensing victory over his foe, the Electric Eel takes Underdog's body to the city lake and throws it in. Free from Underdog, Electric Eel begins his massive crime wave across the city. Still not satisfied, the Eel decides to commit the ultimate crime.
Batty Man, a take-off of Bela Lugosi's Count Dracula is an evil vampire. He, with his hench-bat Georgie and his army of giant vampire bats are committing the crimes all over the country. Polly and Underdog investigate the mysterious goings on at Batty Man's castle. The pair are attacked by Batty Man. Underdog tries to fight off the evil villain's bat army, but the battle is too much for him and the duo are soon chained.
Batty Man has captured Polly and Underdog. The villains raid Fort Knox, returning to Batty Man's castle with the plundered gold. The villains press the gold into a bowling balls. Before long, all the gold bricks are molded and painted black. The villains plan to fence the disguised gold in Europe while posing as bowling ball sales reps. Before they leave for the docks, Batty Man and Georgie place Polly and Underdog onto the conveyor belt that feeds the bowling ball press.
Simon Bar Sinister makes a vacuum gun which he uses to catch Riff Raff, Electric Eel, Batty man and all of their men for his army while Underdog is saving a sinking ship.
Underdog's ring has fallen off his finger; Polly dives underwater to find it. Meanwhile, Simon and his army are using their vacuum guns to steal all the money in the US.
Never before aired story sketched for two young girls of the Underdog creator.
