@nacly season 6, episode final?
The school finds oil, Mr burns steals it, blocks the sun, gets shot, ends in a cliff hanger on "who shot Mr burns?" Which should help you narrow it down

@jensorensen this is the first I heard of this. Ain't no way someone is stupid enough to even suggest such a dumb idea.
The massive cost of it, the social backlash, the political and international backlash and just the engineering of it all.
For what? Just to have the giant mirror break because of some 1cm space debris?