Invader Medic skins made by Angry_Squirrel
Invader Zim is owned by Jhonen Vasquez
Medic model and TF2 copyright Valve

To install put the folder inside
C:\Program Files\Steam\Steamapps\yournamehere\Team Fortress 2\tf

 Zim as Medic came to me after I made GIR's Doom Song into an 
 ubercharge, extra fitting because of the charge ready sound
 ("Enough already! Prepare for some doom!").
 
 Gir's Doom Song ubercharge to accompany medics can be downloaded here:
 http://jimmylikesmen.com/forums/download/file.php?id=147
 (You didn't get this link from me though! <.< >.>)