Guys i know im late but there should be a thing thing 5 with a new story but the best would be if there were a thing thing where you can play against each other online
He has to at least kill the head of Systems Corp.; he said that at the beginning of Thing-Thing 4: "The only way to end this is to go to the top, and eliminate whoever is in control of all this insanity...I'll have revenge on whoever created me. Nothing is going to stop me." by the sheer power of the plot, a dues ex machina of some sort will resurrect him. I'm thinking, it seems like the gas in that last level keeps you from healing. Maybe they turned it off after they thought he was dead (which would make sense; I mean, why waste precious anti-healing gas on a dead guy?). Perhaps he isn't actually dead (the confirmation comes from the head of Systems Corp., Who is miles away and viewing the whole thing remotely), maybe he realized that the gas was suppressing his healing powers and faked death so they would stop shooting at him)At the end the guy said,"take his body to genetics and have them map his genes," if there's a body, he may be somewhat intact, at least.
I think the series ended at #4 because at the end (insert your character's name) dies
oh well THANKS for spoiling the ending... now there's no freakin' POINT for getting past level 1! except maybe following the storyline all the way through...