Tom and Diana investigate a 4400 junior high school teacher accused of child abuse.

The Atlantis base is threatened when the team discovers that an alien entity is in the city. McKay’s experiment with alien technology goes awry.

Sheppard tries to convince Weir to mount a rescue mission to free Colonel Sumner, Teyla, and the others captured by the Wraith.

A new Stargate team embarks on a dangerous mission to a distant galaxy, where they discover a mythical lost city — and a deadly new enemy.

Lex and Oliver Queen return to their old prep school for a reunion, but Oliver’s old friends (and Lex’s old enemies) start dying in mysterious accidents. Meanwhile, Clark learns that…