Craig Veroni

McKay (David Hewlett) volunteers to be the first to try Beckett's (Paul McGillion) newest ATA gene therapy. But things go wrong when the device cannot be removed, and is stopping Dr. McKay from being able to eat or drink and endangering his life.

The Stargate team must rush to save Major John Sheppard (Joe Flanigan) after he becomes lodged in the Stargate, with only 38 minutes until the gate automatically disengages, and Sheppard is expelled into space, where he will surely asphyxiate.

Martha is seriously sickened by meteor dust, and Clark and Jonathan desperately try to help her. But when Clark becomes infected as well, he finds out just how vulnerable he can be. Only a miracle can save Clark and his mother--and the amazing secret she holds within. Meanwhile, Lex confronts his feelings for Helen (recurring guest star EMMANUELLE VAUGIER) as she considers an enticing out-of-town research position. And Chloe and Lana cope with the unthinkable possibility that they may lose Clark forever.

With a group of Wraith hive ships on the way to Atlantis, the team searches for a place to flee and a way to destroy the city. McKay (David Hewlett) leads a team to try and activate the Ancients' orbital weapons platform to destroy the Wraith.

A team of scientists are surveying the city for damage after the storm when they unknowingly release a virus causing hallucinations and death. The virus infects McKay, Zelenka, and Ford leaving Sheppard to stop it from spreading further.

Clark discovers the reason he was sent to Earth after a nightmare foretells a horrible event that's about to befall Smallville, and he visits the cave to seek answers from Jor-El. His biological father tells Clark he must reunite the three crystals immediately or an enormous disaster will devastate the planet that even Clark won't be able to stop or survive. Meanwhile, after finding Lana with Genevieve Teague's dead body, Lex helps the teen escape Smallville then takes shocking action to get one of the crystals away from Lionel. Realizing the elements are connected to Clark, Chloe tries to stop Lex from discovering the truth.