Adventure Time Theme Song

The Adventure Time Theme Song and opening title sequence features all of the main characters and also some of the minor characters. The theme is sung and played by series creator Pendleton Ward. It has the same lyrics as the Animated Short but there are some slight variations.

Summary
The opening title sequence starts with a view of a post-apocalyptic wasteland that features a rat inside of a broken television, several undetonated nuclear bombs. Next, in a snow covered biome, shows penguins including Gunter and two other penguins hugging (with a tiny red heart floating above their heads) that make a few quick quacking sounds and a Snow Golem sitting on a grassy hill nearby. Then the rest of the Ice Kingdom appears including Ice King flying next to his lair, spinning around to face the screen while activating his Ice Powers with his hands. It shows the Candy Kingdom and a large crowd of Candy People laughing and dancing in the middle of the road. After that, the camera quickly scales Princess Bubblegum's Castle, eventually passing the clouds to where we can see Princess Bubblegum as she smiles and waves while riding on the back of Lady Rainicorn. The camera then pans to the right, and zooms into a mountain range showing Marceline playing her Axe-Bass while sitting outside of her cave. She turns and hisses at the audience while showing her pointy teeth. The ending shows Finn and Jake's Tree Fort and then the two of them inside. BMO is seen sitting on a shelf. Finally, they pound their fists together and a loud smashing sound is heard as the theme song begins. This entire ordeal occurs approximately within the span of 12 seconds. When the show's title is seen, Finn (without his green backpack) and Jake float up using feathered wings sticking out from their backs while holding a white piece of cloth that says with Finn and Jake. The sequence ends when Finn and Jake reach the top of a rocky mountain that they were climbing. Finn gets to the top and strikes a victorious pose while Jake lies down near Finn as the show begins.

Lyrics
The lyrics with guitar chords to the theme song are as follows:

Characters
thumb|right|300px|The original intro to the short.The following characters can be seen in the opening sequence:
 * Rat
 * Snow Golem
 * Penguins
 * Ice King
 * Various Candy People:
 * Grape Popsicle Guy, Starchy, Mr. Cupcake, Gingerbread Muto, Sugar Cube, Lollipop Girl, Gumdrop Lass 1, Gumdrop Lass 2, Chocoberry, Mr. Candy Cane, Raisin, Candy Corn, Root Beer Float and the Guardians of the Royal Promise.
 * Princess Bubblegum
 * Lady Raincorn
 * Marceline
 * Bats
 * Two-headed duck
 * Finn
 * Jake
 * BMO
 * Skulls
 * Tree Trunks

Production notes

 * A character peeping over the balcony of the Candy Castle can be seen briefly. According to Pen Ward, this is a cameo by Gingerbread Muto, the Candy Person version of storyboard artist Adam Muto. Pen says he puts Adam in most of his films because it "riles him up."
 * The final shot with Finn and Jake posed on a mountain was inspired by the fantasy art of Frank Frazetta.
 * The beginning of the sequence, with the rising musical tone and flying over the landscape was inspired by the opening sequences of The Simpsons and Pee-wee's Playhouse.
 * Pen states: "If you listen carefully to the recording, you can actually hear Derek Drymon typing on a keyboard in the bit when Jake is walking... a little clickity clack in that wide shot when hMultilenguaje Adventure Time Intro. legs are stretched out. I recorded the lyrics for the opening title in the animatics room where we have this little crummy microphone JUST so that we could add it to the titles and submit it to the network. Later, we tried re-recording it and I didn't like it... I only liked the temp one."

Early versions
300px|right|An early concept To the right is a rough version of one of the many early versions of the title sequence that didn't get used. Many recognizable faces appear, including a worm, Ice King, Iceclops, Marceline, Princess Bubblegum, Lady Rainicorn, Phil, Tree Trunks, Gork, Wendy, and even the Snail.

Alternate versions
"Fionna and Cake" is the first episode to feature an alternate version of the opening theme, performed by Natasha Allegri instead of Pen.

thumb|300px|right|The comparison of the Fionna and Cake intro and Finn and Jake intro.

Trivia

 * During the post-apocalyptic wasteland scene, you can see a gray arm with purple spots and a bite mark coming out of the tree that has axe and arrows in it. It has been confirmed to be a zombie arm.
 * At the end of the "Fionna and Cake" version there are no skulls on the ground and Cake curls up and falls asleep instead of grabbing Fionna's leg and smiling, as Jake did to Finn.
 * In Issue 1 of the Adventure Time (comic), it is seen that Jake was actually filming the opening sequence.

Error

 * Before Marceline opens her mouth, her fangs are blunt. This is also seen in the episode "Daddy's Little Monster."

Storyboards

 * Storyboard 1:


 * Storyboard 2: