Smallville - Season 5 Episode 7 -

While visiting Lana in Metropolis, Clark opens a package addressed to Lana apparently sent by Lex Luthor and is wounded and infected by a splinter of silver kryptonite. This unusual piece of kryptonite causes Clark to have paranoid delusions, and he sees Chloe, Jonathan, Martha, Lana and Lex plotting against him. He defends himself against his "enemies", jeopardizing the lives of his dearest friends and family. But eventually help comes from a most unlikely of source: Milton Fine.