Invader Zim

Invader Zim is a cancelled 3D adventure/platforming game in development by Cor-Son Games and Unique Development Studios. It was going to be released sometime between 2003 and 2004, but it ultimately got shelved by the publisher through various factors.

Gameplay/Plot
According to the developers, the game would've involved a new extra terrestrial hunter who antagonizes Zim and frames Dib for nearly destroying the former's base. Dib is sent to an intergalactic prison and must escape while Zim attempts to stop the hunter from exposing him. Another plot line involved Gaz getting trapped in a video game (possibly due to discovering the true motives of the hunter) and has to escape.

Only Gaz's gameplay was revealed and fully completed, along with a level involving Zim where he possess the mind of a student in an attempt to get out of school. The remainder is only known through concept art and word of mouth.

Cancellation/Aftermath
Numerous factors led to the game's cancellation, them being Cor-Son's co-developer going out of business well into development, financial issues on the former's part, the source show getting cancelled and Nickelodeon instilling censorship on the game's writing. Cor-Son intended to keep the game closer to it's original dark roots, but Nickelodeon wouldn't go through with the game unless they heavily re-worked it.