Alright, first of all, I'm not sure what Scuzzy is (Part dog, part rat, part cat, part television?) I'm not sure if anyone knows what Scuzzy is; not even Mike the TV (because he calls him a "verminous familiar")! Scuzzy is kinda like a cat's head with a tail and a little tv in the top glass dome... I don't know, but he..uh...she...hmmm... it's cool none the less.. (it's actually a he.)
We know that Scuzzy is Hexadecimal's pet and...well...that's about it. Scuzzy does help Hex to escape Megabyte's Tor in Season 3.
His last appearance was during the Mainframe Strolling Players. As the kareoke words were at the bottom of the screen...there was "follow the bouning Scuzzy"!