Adventure Time with Finn and Jake Wiki


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This article is about the character. You may be looking for the episode.
Name Jermaine
Sex Male
Age 30's (as of "Joshua and Margaret Investigations")
Species Dog

Jake (older half-brother)
Click "expand" for full list

Finn (adoptive brother)
Joshua (father)†
Margaret (mother)†
Charlie (half-niece)
T.V. (half-nephew)
Jake Jr. (half-niece)
Kim Kil Whan (half-nephew)
Viola (half-niece)
Unnamed grandmother mentioned in "Ignition Point"
Lady Rainicorn (half-sister-in-law)
Martin (adoptive uncle)
Kim Kil Whan's Wife (half-niece-in-law)
Kim Kil Whan's Daughter (half-great-niece)

Introduced in "Crystals Have Power"
Latest appearance "Joshua and Margaret Investigations"
Voiced by John DiMaggio

Jermaine is Jake's younger half-brother, the adoptive brother of Finn, and the son of Joshua and Margaret. He is the only biological son of both Joshua and Margaret due to the fact that Jake came from a Shape-shifter that poisoned Joshua and Finn being found in the woods. He is introduced in "Crystals Have Power" in one of Jake's flashbacks where they were both children. Jake hurt Jermaine in the flashback, which seems to have left an impact on Jake causing him to avoid violence as a way of solving problems.

After Jake hits his head and apparently begins a spiritual communication later in the episode, Jermaine tells him that he understands Jake did not mean to hurt him. Jermaine explains that they are able to talk in this manner because they are both dreaming at the same time (though Jake does not appear to be dreaming or otherwise affected by hitting his head).

A photo of Jermaine, alongside Joshua and Jake, is seen in Finn's memory in "Memory of a Memory." In "Jake the Dad," a hologram of his younger self is seen in Mom's manual with Finn and Jake. Although Jermaine's age is unknown, he seems to be around the same age as Jake, considering they were both babies in Margaret's manual. Joshua briefly mentions Jermaine in a videotape in "The Pit" when telling his children where he has gone searching for Kee-Oth the Blood Demon.

Jermaine's birth is depicted in "Joshua and Margaret Investigations." He is revealed to be the only biological child of Joshua and Margaret, as Jake was the result of Joshua being infected with the DNA of a shapeshifting alien and creating a dog/alien hybrid, while Finn was adopted. This makes him and Jake half-brothers due to only sharing Joshua as their biological father.


Jermaine resembles Jake, but with missing teeth, slight chin stubble, and prominent eyebrows. In Jake's flashback, Jermaine was wearing red boxing gloves. He also appears to be slightly flabbier than Jake.

Episode appearances

Minor appearances



No, man, we're just dreamin' at the same time.

—"Crystals Have Power"

Yo, that was an accident, I knew you were just horsin' off!

—"Crystals Have Power"


  • According to Kent Osborne, "Jermaine's off doing his thing and he likes to paint, but he doesn't really like to travel."[1]
  • Jesse Moynihan mentions on the Season 2 DVD Commentary for "Crystals Have Power" that he has tried to find a way to use Jermaine in several episodes, but has not been successful yet.
  • Since Jermaine said he and Jake were dreaming at the same time it is likely that Jermaine is alive or alive in a coma.



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