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.
Dimension zapping is suspended when the power goes out on the whole block, so Larry invites Rippen, Penn, Boone, and Sashi to his mansion. When Larry's pet teacup elephant goes missing, Penn and Rippen compete to see who can find him first. Meanwhile, when the power comes back on, Phyllis and Phil battle each other in another dimension.
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.
