Question: As a longtime fan of Smallville, I’m dying to find out if Jor-El will turn up before the final curtain. Will Clark reconnect with his long-lost father? —Wade


Ausiello: I hear Terrence Stamp turned down an offer to appear in the flesh, but you’ll once again hear his voice in the penultimate episode when the Superman icon gives Lois the Best. Wedding. Present. Ever: Clark’s powers for a day.

http://www.tvline.com/2011/04/ask-ausiello-spoilers-smallville-glee-castle/