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Here is the promo trailer for “Rabid” which is the third episode of Season 9 of “Smallville”. Here is the premise via CWTV.com:
Zod (Callum Blue) and his soldiers release a virus into the air that turns humans into zombies. The only way to stop it is to make an antidote from the blood of another Kryptonian. After Lois (Erica Durance) is infected, Chloe (Allison Mack) pleads with Clark (Tom Welling) to donate his blood to stop the epidemic, even though it risks outing him to Zod.
Looks like a great episode!