Goes to an alien planet (Delta Vega or whatever), acquires "weapon of mass destruction" powers but they don't manifest themselves before...
1. he returns to Earth where he starts metamorphosing into a godlike creature, goes mad and blows up a bunch of spaceships
2. Earth isn't enough for him so he takes off into the unknown to stir some more shit
3. cynical trekkies have no imagination
5. Paramount makes shitloads of PROFIT
Aside from that being a bit tortured, you didn't address any of the major points. There's no evident correspondence between this synopsis and anything specific to Mitchell's story, and no other good reason to suspect that it's Mitchell.