|First appearance||"Love's Labours Lost in Space" (1ACV04)|
The Nibblonians are the oldest known species in the universe. They stand about one foot tall and have two large eyes, as well as a third eye on an antenna in the center of their foreheads. They have black fur (leaving them prone to hairballs), with pale yellow circles on their bellies and around their mouths. The males have fangs but the females don't. They are widely considered to be the cutest race ever to exist, though this is something the Nibblonians resent.
The Nibblonians are a proud, ancient race, their history extending 17 years before the universe existed. This might have been explained in "The Late Philip J. Fry" where it is shown that time loops or it could be that their race grew to 17 in a different universe before coming to ours. Brilliant and powerful, since the dawn of time they have battled their ancient nemesis, the Brain Spawn.
The Nibblonians live extraordinarily long lives. It is not known at what age, or even if, they die of old-age; all that is known is that they can live far in excess of 1,000 years. They seem to eat primarily meat (only Nibbler has been shown eating anything else), and in prodigious quantities. They regularly consume many times their body weight per day, without gaining weight. Nibblonians have a "cuteness reflex" that kicks in when they scared or in danger, it causes them to act like helpless, adorable creatures. As waste, they excrete pellets of Dark Matter, an extremely heavy material formerly used as a starship fuel. The mechanism by which meat, which is made of ordinary matter, is converted into dark matter inside the Nibblonians advanced digestive tract is unknown, it may be based on a kind of black hole or pocket dimension, whatever the case; Nibblonians are capable of swallowing themselves to enter their digestive systems. The Nibblonian eyestalk is capable of emitting several types of energy that can wipe memories or burn skin.
- Strangely, even though they are made up of parts that many would consider ugly (eyestalk, fangs, one huge nostril), the combination makes them quite cute and cuddly, an image they abhor.
- The Nibblonians' strongest fighter space craft is their Kitten-Class Attack Ships.
Ken: When the universe was forged in the crucible of the Big Bang, our mighty race was already 17 years old.
Nibbler: We live long and are celebrated poopers.
Fiona: The brains are weakening. [She presses an intercom button.] Nibblonians to Nibble stations. Prepare cuddle bug for deployment in 40 nibblets.
Nibbler: [Sighs.] Sometimes I fear we are cute.
Fiona: Oh, niggle-snoosh!
- Nibblonians appear in too many episodes. The following list only covers episodes with Nibblonians other than Nibbler. See his appearances here.