These are concept art I made for Nicktoons: Globs of Doom (2008), a Wii & PS2 game developed by Incinerator Studios & published by THQ.

(2007) Ghost Dog
This is a boss concept art featuring Ghost Dog from Danny Phantom, who got infected by alien goo & turned into a 3 headed Cerberus-like beast.

(2007) Girl Eating Plant
The boss concept shows off Girl Eating Plant, one of Jimmy Neutron's experiments, got mutated into a giant mutant monster due to alien goo, and became one of the boss in the game.