R.I.P. Megan - The best friend nobody wanted.

What's a good superhero show without a SUPER retcon? Oliver is back in town and gets poisoned by someone from his past. Chloe uses her new Brainiac skills, and her E.R. Lover Davis, to track down an antidote. Clark finds out that Tess and Oliver know each other from their Jungle Freak-Off days, and is the only one that knows of this rare poison. Meanwhile, Lois becomes toxic herself while giving Oliver sponge baths as he's dying. Also, WHERE'S JIMMY?!