SpongeBoy Ahoy! (SpongeBob SquarePants Pilot, 1997)

Exactly a year after Rocko's Modern Life had ended, Stephen Hillenburg and several crew members of Rocko's Modern Life begun working on a pilot for Spongebob Squarepants. The original name for Spongebob as SpongeBoy and the show was to be called SpongeBoy Ahoy!

This idea was ultimately scrapped and replaced with Spongebob Squarepants due to a cleaning product of the same name existing. To avoid copyright infringement, it was reworked.

Despite this, the original SpongeBob pilot has yet to surface online. The only evidence of its existence is the original opening sequence found and a rare screenshot that's very hard to come by of what appears to be the original Spongebob auditioning for a place at the Krusty Krab. Asides that, nothing else has found its way online or one home media.

It is currently unknown if Hillenburg himself or anyone else working on this Pilot still has a full copy.

EDIT 11/24/15: The SpongeBob version of this pilot has been uploaded by LMW user "Joey!" on Vimeo. https://vimeo.com/137892254 The password is AHOY. It's basically identical to the "Help Wanted" segment in the first official Spongebob episode, except some minor differences including the opening sequence.