Go ahead 'gpddsmith', make my day...
Yes.
From the AFS FAQ, which is posted weekly and can be viewed online at
http://afs.rebelalliance.de/
3.J - I've heard such and such happens in the novels/graphic novels but which one?
ii) In what story did Luke Skywalker turn to the Dark Side?
Luke was seduced to the Dark Side in the 'Dark Empire' graphic novel series. He is later recovered by Leia.
iii) In what story did Emperor Palpatine return as a clone?
Again in 'Dark Empire', a clone of Palpatine is discovered, who then succeeds in turning Luke to the Dark Side (see above). The clone story also continues in 'Dark Empire 2' and 'Empire's End'.