To use this all you need to do is use the Launcher and pick 
Gohan.  Then put this cog into 
C:Program Files/LucasArts/JediKnight/Resource/Cog
then start a game and pick the character you just made
and when you level your skin will change accordingly.


This only works with the LEAKED BETA of DBZ4.0 AKA DBZTDIR.
I am in no way affleated with the team and found this out with
the help of a few people.