Fantastic

 is a man living in the Mojave Desert in 2281.

Background
Fantastic is a lazy, laid-back surfer-style idiot, posing as a "technician" with a "'theoretical' degree in physics" to weasel NCR's puppet government out of what is essentially free money. He keeps the Helios Plant operating at 1% efficiency, claiming all sorts of excuses as to why he can't get the plant to produce the other 99%, and why NCR should keep paying him.

Interactions with the player character
You can either help him get the laser running for the NCR, or kill him and use it for yourself.

Appearances
appears in Fallout: New Vegas.