(Note: In the original short, Finn is named Pen.)
Pen is sleeping under a tree in a sleeping bag when he wakes up and asks Jake what he is doing. Jake tells Pen he is meditating to connect his mind to the internet. Then he shows Pen a dance he "downloaded." Just then, Princess Bubblegum's rainicorn, Lady Rainicorn, flies by crying. Jake grows and the two follow the rainicorn. Pen tells her a joke to cheer her up, but it turns into a failure and she just keeps on crying.
They follow her into the Ice Kingdom where Ice King starts shooting at Lady Rainicorn with frozen lightning bolts. Pen says that Ice King is an oxymoron and Jake shrinks. Jake sees that Ice King has trapped Princess Bubblegum. After Pen puts on a turtle-neck sweater, he asks Jake if he wants his booties and gives them to him. Pen and Jake yell "Adventure Time!," then jump, slide onto the ice and surf on Penguins. They land into the ice, but they spotted an Iceclops. After they throw snowballs at it, they spot a Snow Golem and they throw snowballs at it as well. Then they see a Fire Elemental who asks for directions to the sun. Pen gives the directions, then throws a snowball at the Elemental. This makes him upset so he asks how old they are. Pen says that he is twelve and Jake says he is twenty-eight.
They then hear an evil laugh and they look up to see Ice King. Jake stretches his legs to boost Pen up to Ice King. Pen tells him to stop it and Ice King tells him to stop meddling and that Pen and his dog cannot harm him. Pen says that Jake is not his dog but his friend, and then kicks Ice King into his house and cave, where there was a drum set and a pair of underwear. They kung fu fight as Jake flirts with Rainicorn. Pen asks Ice King why he is always stealing ladies. Ice King replies that he is going to make one marry him. Pen says that the king's idea is stupid, and Ice King says Pen's hat is stupid. Pen gets mad and kicks him in the face as he screams the highly known words: "My hat is AWESOME!!!" Then he realizes that Jake is not helping him, so he looks out to see him talking to the Rainicorn.
Ice King uses his frozen lightning bolts to freeze Pen in a block of ice. Then, his mind gets transported back in time and onto Mars, where he meets Abraham Lincoln. Lincoln tells Pen that he needs to believe in himself. Pen screams "NEVER!!!" as his mind is transported back to the present and breaks out of the ice block. He sees Ice King fly away with Princess Bubblegum who yells for them to help her. Rainicorn, Pen, and Jake chase after Ice King. Pen jumps and grabs the princess as they land on Rainicorn. Then Jake knocks the crown off of Ice King's head and Ice King falls to the ground. Jake walks away on his outstretched legs.
Pen and the princess land as Pen tells her that she is free. The princess kisses and thanks Pen. Jake comes and asks what is going on and Pen says nothing is. Embarrassed, Pen drags Jake away and says that they have stuff to do. Jake denies it and says that they have nowhere to go. Pen laughs and says that "adventure awaits."Jake says that he does not see an adventure going on anywhere and that they should just sit there and talk about their feelings. Pen randomly points at three Ninjas stealing an Old Man's diamonds. He says bye to the princess and the princess bids farewell. Pen and Jake say "Adventure Time!" again and they run off.
- In Issue 3 of the Adventure Time comic, when Finn tells everyone how they can beat the Lich, he says that just like Abraham Lincoln said in the past and on Mars, you need to believe in yourself. That was a reference to when Pen (aka Finn) was frozen and he met Abraham Lincoln in the past and on Mars.
- In Issue 9 of the Adventure Time comic, it is explained why Pen's sleeping bag disappeared.
Differences between the short and the series
- Pen (aka Finn), who is named after series creator Pendleton Ward, is 12 years old and does not live in his usual tree house in this pilot; he sleeps under a normal tree.
- Lady Rainicorn speaks by cooing like a dove instead of speaking Korean.
- All of the voice actors in this pilot are different from the actors who performed voices in the series, aside from the actors for Jake and Abraham Lincoln.
- The title card resembles the title screen in the opening sequence of the series, except that Pen (aka Finn) has his hand on his forehead instead of in the air, and Jake is on his left instead of on his right.
- Some of the characters have slightly different appearances. Pen, for example, has a more rounded hat, and the hole for his face is a semicircle instead of a circle, and he does not appear to have any missing teeth. Jake's jowls are bigger, and his head is less rounded. The penguins are bigger and blue instead of black. Princess Bubblegum's tiara has a red jewel in it instead of a blue one, she does not have pink trims on her sleeves, and her hair is shorter. Ice King's beard is noticeably smaller and more pointy, and his skin tone is lighter. Lady Rainicorn's coloring is different, and her movements (in flying) are different. For example, her head waves and her tail follows the same movement unlike in other episodes where her head is straight and her body waves.
- At the start of the short, Jake is floating and seems to have the power to connect to the internet with his mind.
- Ice King's drums are different in the animated short than in the series; his drums are black and they do not have the words "#1 BABE."
- The background and designs of the places are not as rummaged and littered as they actually are in the series.
- Abraham Lincoln seems to have a halo around his head and is disproportionately bigger than he was in "Sons of Mars." However, this may only be because Mars was a lot smaller.
- Earth is depicted without a chunk of it missing and the continents where they are supposed to be.
- The short was rated TV-Y7 when it aired on TV while the series is rated TV-PG.
- The Snail who is hidden in every episode to date is not in this short.
- Other main characters like Marceline and BMO don’t appear in this short.
Similarities with the series
- The scene where Jake was meditating looks similar to a scene where he meditates in the episode "Marceline's Closet."
- The show has made references to this short in various episodes, like Abraham Lincoln on Mars.
- Pen uses math-related phrases, such as "algebraic," (after Lady Rainicorn flies over them) "mathematical," and "rhombus" (after riding the penguins).
- When Pen and Jake first enter the Ice Kingdom, they run into a mob of penguins and Pen yells, "Penguins!" This is very similar to a scene from "Prisoners of Love."
- The boots Jake put on are similar to the ones he wore in "The Chamber of Frozen Blades." The way he put them on is also similar.
- When Pen and Jake elevated into Ice King's Castle, Jake's boots disappeared.
- At the start, Pen's red sleeping bag was near the tree. But when he starts making booping sounds like a computer, it is gone until they start dancing.
- In Issue 9 of the Adventure Time comic, Finn and Jake accidentally traveled back to the animated short, where Finn recalls that he had people call him "Pen" back then because he was so into pens. When he and Jake depart, Finn leaves behind a note telling Pen he should go by his real name, and the two inadvertently take along the sleeping bag (explaining why it vanishes for no reason).
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- Article on Art of the Title about the title sequence, with the original short.