The Intruder (Character)

The Intruder (Real name unknown) is a big red blob-like creature featured In the 2000 T.I.E. (Total Immersion Event) The Intruder.

Intruder Aboard the Absolution
The Intruder invaded the Ghost Planet Spaceship Absolution, apparently in search of sustenance. It apparently stuck onto the starboard engine chamber, and cut through the ship's hull. The ship's AI, SARA, detected this, and promptly alerted TOM, who was in the middle of a conversation. When TOM set out to search for the Intruder, it attacked him, sending TOM flying out of the ship, and disabling his nuclear reactor.

By the time TOM was back aboard the Absolution, the Intruder had eaten multiple Clydes, and had grown to the size of rooms on floors 48, 49, and 50. TOM promptly went on a search to find the Intruder before it got to the starboard engine. TOM was searching for The Intruder for quite some time, until he finally found it. TOM promptly proceeded to use his laser against it, but to no avail. TOM, having no other recourse, once again fired a laser blast at it, only momentarily stunning it before The Intruder devoured TOM.

Much later, the Intruder had consumed most of the starboard engine, but SARA, having kept a copy of TOM's programming, proceeded to upload TOM into a new body, dubbed TOM 2. TOM 2 then set 2 explosive devices in the starboard engine to cut The Intruder loose before it completely took over the ship.

Aftermath
Apparently, the Intruder was not destroyed along with the Absolution's compromised engine, as it has been announced by the Toonami team that TOM will once again face the gelatinous antagonist that devoured his original body in The Intruder II.

Trivia

 * The Intruder resembles the science fiction movie monster, the blob. It also boast similarities to the "grey goo" concept.