I. C. Wiener

I. C. Wiener is a fictional employee of Applied Cryogenics. While he worked at Panucci's Pizza, Fry is called to deliver a pizza to this person, and understands the prank call too late. Instead of making the trip a complete waste, he eats the pizza.

In "Anthology of Interest I", Fry asks what would've happened had he not fallen into the freezer-tube, and it is revealed that the existence of the universe itself is reliant on his having done so. When a Fry-hole (or Hawking-hole, depending on whom you believe) opens to reveal monsters, and one of them claims to be "Icy Whatever" in order to acquire the cheese pizza.

Fired from Planet Express in "The Cryonic Woman", Fry gets a job at Applied Cryogenics. He then orders a pizza under the name I. C. Wiener, which Leela delivers.

In "The Why of Fry", it is finally revealed that the original "I. C. Wiener" was none other than Nibbler, who placed the call in order to lure Fry into Applied Cryogenics, where he could be frozen for a thousand years to fulfill his destiny of saving the entire universe.

Trivia

 * I. C. Wiener's address, and in turn, Applied Cryogenics', is actually David X. Cohen's mother's address.
 * When Nibbler gives the name to Mr. Panucci in "The Why of Fry", he gives it in a very formal way resembling typing instructions: "I-period-C-period Wiener". Strangely, Panucci sees nothing odd about this, though he does notice that Nibbler does "sound like you've got some kinda tiny head on your shoulders".
 * In the original storyboard for "Space Pilot 3000", the false name that is called into Panucci's Pizza is "W. Disney", for "Walt Disney", a reference to the urban legend about Disney being cryogenically frozen.