Do not EVER – under any circumstances – send an agent a query for a novel based on someone else’s characters or world. Just don’t.
As for this poor, ignorant person, I give them 1.5 Jareos.
For more on the subject, I refer you to several of our own professonals: Rodger McBride Allen, Karen Traviss, and Abel G. Peña. You might also want to check out Keith R.A. DeCandido’s post on the difference between profic and fanfic.