Joshua and Margaret Investigations

Synopsis
Finn and Jake's parents hunt an unearthly menace in the woods.

Plot
The episode opens up on the treehouse with Finn, Jake and Beemo are celebrating Jake's birthday. While Finn and Beemo chant "Happy Birthday", Jake gobbles his birthday cake. Finn mentions to Jake how he's a year older but still looks good, Jake replies saying that it's because of "Mom and Dad" passing down good genes. Finn begins to remember Mom and Dad which leads to him and Beemo asking Jake to tell a story about his parents, or a "Birthday story"

Major Characters

 * Joshua
 * Margaret
 * Poisonous Creature

Minor Characters

 * Finn
 * Jake
 * Jermaine
 * Snail
 * Tree Trunks
 * BMO
 * Wyatt

Mentioned

 * Marceline
 * Leftenant Candy Corn

Trivia

 * This episode was announced during the 2014 San Diego Comic Con along with a sneak preview of the episode.
 * This is the longest episode name of the series, second being "Thanks for the Crabapples, Giuseppe," an episode airing on the same season. Third being "The Prince Who Wanted Everything."
 * This episode takes place on Jake's birthday.
 * It is revealed that Jake's existence is a complete accident and that he is not biologically related to his mother.
 * The episode also explains that Jake got his stretching powers from being half shape-shifting creature. This proves that Jake was wrong about getting his powers from rolling around in the mud.

Cultural References

 * While Jake being born of his father Joshua is similar to the birth of the creature from the 1979 movie ', him immediately singing and dancing after birth is exactly like the parody situation in the 1987 comedy '. In both the original and the parody, John Hurt portrayed the "father" of the creature.
 * In Margaret's weapon room, a Pokéball from the series can seen on the right side.

Episode Connections

 * This episode reveals the origin of Jake and his stretching powers, which had been hinted at an unknown even to Jake; prior to this episode he had thought in "The Witch's Garden" that he had gained them from rolling in a magic mud puddle as a puppy. It likewise reveals the connection he has to his brother Jermaine, who is technically his brother but "younger" due to being born mere moments after Jake as first noted in "Crystals Have Power."