Clark and Lois discover his cousin Kara's spaceship, but she knocks out Lois before they can open it; Clark heads to the Fortress of Solitude to start his superhero training; Lex makes a stunning discovery regarding Lana and Project 33.1.
Chloe calls on some old friends to help battle Zod and the Kandorians; Clark and Zod fight for control of Earth.
A pipe bomb explodes in one of Lex's secret labs; the enraged spouse of a special-forces soldier takes Lex hostage, and Clark tries to rescue Lex.
A scientist dies after ingesting a cloud of blue powder that disintegrates his bones; a person from Walter's past reluctantly agrees to help with the investigation.
Gina almost ruins Donna's new men's designs; Steve struggles with fatherhood; Kelly seeks direction; Dylan applies to college.