Laconic / The Punishment

The trope: You did a bad thing, so we'll make you immortal and give you superpowers; but you will suffer along with everyone else.

The Portal fanfic: GLaDOS brings Wheatley back from space as a live human, but he doesn't know why.
Don't visit the unabridged version HERE, or we'll put you in charge of the legions of Hell.

http://tvtropes.org/pmwiki/pmwiki.php/Laconic/ThePunishment