On a spoiler scale of one to five, where one is telling someone whether the next episode is a monster of the week one or a plot arc one, and five is telling someone the big huge twist that shocked everyone when they saw it, I would say a guest star is a one (if this is their first time on the show) or a two (if they've shown up before). Possibly even a three, if their reappearance is going to have some major plot ramifications, eg: the last time we saw that character he died.
Oh, Wade--it's Kavan Smith, who was on SpN for a split second on the Dr. Zombie ep, and who played Wade on one ep of Smallville, but that didn't matter, I fell head over heels for him and wrote him in a coupe of my SV fics. He was on SGA, too, he played Major Lorne. :D
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I dunno. Not for me, i guess, since 'Wade' rings no bells in my brain. So i am...blissfully unspoiled!
*twirls*
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