Smoke domain visible while rendering?

Hey fellow blenders,
I need your help. I have energy in the form of smoke omitting from this guy’s head. When I goto render him, the domain on the smoke renders in this image(in the form of an outline).
Can someone help me out here, please? What can I do to make the outline disappear, or is it not possible in cycles?
Here’s the blend file
Please and Thanks,
Chavis