Penn doesn't want to celebrate Christmas because his parents won't be there. However, he is sent to the North Pole to fill in for Santa Claus to save Christmas.

Penn, Boone, and Sashi are zapped into an underwater world to save a society of fish people, but their mission gets complicated when Penn finds out that Boone is afraid of water.

When Penn and his team are zapped into an old west cowboy world where the cowboys ride dinosaurs, the town sheriff joins them on their mission to prove he still has what it takes.

Penn, Boone, and Sashi are zapped into a world of living stuffed-animals to save the town's mayor from giant babies.

Penn and Boone's friendship is put to the test when they both fall for a beautiful alien princess that they must escort though the jungle back to her tribe.

When Penn, Boone, and Sashi are zapped into a world where everyone has superpowers, Penn learns that you don't have to have superpowers to be a hero.

After Penn and his team are zapped into a desert world filled with flying carpets, Penn begins to question Boone's abilities as the team's part time wise man.

Exhausted from recent missions, Penn is relieved when he is zapped into a seemingly ordinary job as a food court employee in a mall, but it turns out that Penn and his team are in an alternate world where a zombie apocalypse is taking place.

When Penn, Boone, and Sashi are zapped into a clown world as clown cops, Sashi must tap into her silly side to save the mission.

Penn becomes concerned that Sashi takes her role as sidekick too seriously. Meanwhile, he and his team are zapped into a new world as spaceship heroes to save a starship from destruction, but the mission is complicated when Sashi accidentally turns Penn into a weird space animal.

Phyllis has Penn and his team watch a play-back of their just-completed mission in which they were explorers in a race against time to return an idol to a temple while being chased by Rippen and a giant man-eating toilet.

When the team is zapped into an alternate world where Penn is president, Sashi is a general, and Boone is a Supreme Court justice, Boone finds himself on the most popular game show in the galaxy where he must plead his case and compete against Rippen in an outrageous contest that will determine the fate of the Earth. However, Boone has a fear of public speaking.

While in a medieval world, Rippen holds tryouts to replace Larry as his number two, and Penn goes undercover as Rippen’s new minion to find a village’s stolen gold.

Penn and his team are zapped into a world where they are enormous yet misunderstood monsters. They must convince the human President of a nearby island city that the monsters mean them no harm.

In a world where everyone is a cereal mascot and cereal is grown on farms, Penn seeks the help of an imprisoned Rippen to catch The Milk Man, a villain threatening to flood all the cereal crops with milk, turning them soggy.

Penn, Boone, and Sashi are zapped back to the super hero world to help Captain Super Captain defeat his twin brother, Professor Evil Professor, who has turned all the superheros evil.

Concerned about his abilities as a leader, Penn and his team are zapped into a world where they are sports balls to teach the other balls to defend themselves from their enemies.

The team zaps into a musical fairy tale universe where everyone sings when they speak. Penn is a princess, Sashi is a knight, and Boone is a fairy godmother. During their mission to save the queen from being turned to stone, their true feelings come out in song.

Larry becomes an acting part-time villain as he substitutes for the ailing Rippen. The team's mission is endangered when Penn takes pity on Larry.

When Penn and his team are zapped into a world where the colorful Hues and the gray Drabs are in a feud, they must stop Rippen from destroying the rainbow rocks, which provide the world's colors.

When a power outage prevents anyone from zapping, both teams of part-time heroes and part-time villains kill time at Larry’s estate by trying to locate Larry’s missing teacup elephant.

Rippen falls for a space villain named Lady Starblaster.

Penn and his team return to the cowboy world and get help from Sheriff Scaley Briggs to stop Rippen and Briggs' daughter Amber from rustling Cow-o-saurs.

After Boone fools around on the zapping platform, he and Penn swap roles, so Boone becomes the hero.

Penn and his team return to the underwater world and must find a royal fish named Rufus.

When Penn discovers that Phyllis is trying to locate the Most Dangerous World Imaginable to bring his parents back to Middleburg, he takes matters into his own hands leading to catastrophic results.

Penn must overcome his jealousy of popular fellow cadet Blaze to complete his mission and finish at the top of his class at Dragon Flight School.

Penn accidentally drinks a potion that turns him into a Rippen-monster, whenever he loses his temper.

A clown-style street race is held in Chuckle City to determine the next mayor.

Penn endangers a mission when he discovers he has the lowest tech gadgets available.

Penn tries to solve a twisted mystery in a world where everyone is a plant.

Boone gets zapped into a barbarian wizards world where he is tasked with conjuring up a spell to stop Rippen.

Uncle Chuck and Aunt Rose accidentally break an essential part of the machine that zaps Penn back from other worlds.

The kids get zapped into a backyard world where they become military action figures.

Penn and his friends merge as giant metamorphosing robots to fight for control of an alien planet.

The fate of two alien planets is tied to the outcome of a sporting event.

Penn's origin story is revealed in a flashback to his first day of high school when he learns his parents are part-time heroes instead of insurance salespeople.

Phil and Rippen tunnel into The Odyssey and damage the Multi Universe Transprojector, causing unbalance in the multiverse. Vortexes form in every world that Penn and his team have visited. Penn, Boone, and Sashi must travel to each world and close all of the vortexes before everything and everyone from all the worlds get sucked into nothingness. During their mission, Penn finds a crystal shard in the nothingness, which, according to Phyllis, is the key to finding his parents.

After a recap of the events of the first season. Penn, Sashi, and Boone are sent to a pirate world where whales act as the ships. Penn must get to a treasure before Rippen does, but finds himself teaming with a competitive female pirate in the process.

The trio return to the dragon world which finds itself under attack by winged unicorns which threaten to destroy Wingfire Academy. However before the team can fight them, they must get Blaze, who has fallen into a slump from a previous defeat by the unicorns, back on his feet to help them.

The trio is transported onto a space ship whose human occupants are set to arrive on a new planet to colonize. However, Penn finds himself in the form of a mouse and must save the ship from a feline Rippen who seeks to plunge it into a black hole.

The trio find themselves in a fairy world in the midst of a wrestling tournament which Penn and Sashi must win to keep the forest out of evil hands. However, things are complicated by an argument between the two, forcing Boone to try to get them to mend their friendship.

Sashi is called in for sensitivity training which Principal Larry forces Penn and Boone to attend as well. The methods seem to work to quell her anger, but soon become a hindrance when the trio return to the underwater world for a mission.

Boone and Sashi have to build a Penn robot to save a world from the forces of evil.

Team Zero return to the Ball World to save its past from Rippen.

A return to the Knight World causes issues for Boone when he meets a better wizard than himself.

In a world that is a Rock, Paper and Scissor version of Game of Thrones, Penn's team face a siege by the Scissorian army.

Penn's team has to save a ghost from supernatural exterminators Rippen and Larry.

Penn has to take care of The Chinchilla -- which causes problem on their return to Plush Toy World.

When Sashi's parents find out about her real job with Penn and Boone, Penn has Phyllis zap her and her parents into the Outer Space World.

A mission in Cereal Mascot World gets weird when the Milkman makes an appearance.

Penn's emotions cause problems for the latest mission.

Penn, Boone, and Sashi visit an anime dimension to compete against Rippen in a ninjutsu tournament to bring back an island back with the help of 3 new friends.

Penn has to stop Rippen from ruining a dinner in a sitcom dimension.

Penn, Sashi, and Boone must make the Princess Argelbleccht and Grinkon fall in love.

Boone is kidnapped and Penn and Sashi must solve the mystery and find him.

Vonnie must rescue Brock from the belly of a giant chicken.

Penn, Boone and Sashi must stop Rippen from ruining Middleburg High when he switches bodies with Larry.

Boone gets a bad report card from Phyllis, making his parents mad. He tries to fix this while on a mission in the Giant Monster World.

Rippen's origin story is revealed for his first day as a part-time villain.

Penn, Sashi, and Boone must travel to the three most dangerous places in the multiverse in order to free Penn's parents as Rippen plans to conquer the Most Dangerous World Imaginable with Larry and those with him after having to close its portal from the other side.