|First appearance||"Space Pilot 3000" (1ACV01)|
The full extent of the jars' functionality may never be known, however the jars are all capable of sustaining the life of one human's head. The heads are still able to eat and any waste is presumably filtered. The heads are able to survive out of their jars for an undefined period of time. Jars allow the inhabitant to control robotic limbs and bodies, while the jars themselves can contain attachments such as a pen to sign one's name. Jars are usually open at the top, though lids are available, but the liquid is able to remain within the jar while flying through space even when lidless.
Multi-head jars (3ACV16)
Dome covered version, seen in Futurama comics, able to safely float freely through space.
Matt Groening's head fires|(6ACV11)]]
The heads in jars appear in most of the episodes so this list includes the key appearances for them.
- "Space Pilot 3000" (1ACV01)
- "A Big Piece of Garbage" (1ACV08)
- "A Head in the Polls" (2ACV03)
- "A Leela of Her Own" (3ACV16)
- "Crimes of the Hot" (4ACV08)
- Bender's Big Score
- "Lrrreconcilable Ndndifferences" (6ACV11) Matt's jar with built-in gun.
- "Futurama" (video game)