Liz Parker learns Max Evans' out-of-this-world secret when he saves her life and must rely on her to safeguard his secret as an orphaned extraterrestrial.

Liz tries to maintain her relationship with Kyle despite her deep bond with Max; Michael is obsessed with the idea that there was another alien in Roswell in 1959 and tries to decipher the meaning of the flashes only he sees. Meanwhile, Liz suspects the new guidance counselor Ms. Topolsky is hiding something, especially when she sees her with Michael's file.

Isabel is concerned about Maria's nervous reactions to Sheriff Valenti, so she invades one of Maria's dreams to determine whether she can keep the aliens' secret.

Max is injured in a car accident and Liz pressures Alex to help protect him from medical procedures that could expose his identity by providing blood samples to replace Max's.

A freak December heat wave hits the town and sparks romance as Michael's relationship with Maria heats up and Liz's infatuation with Max intensifies; meanwhile Isabel enters into one of Alex's dreams only to discover her likeness already there and dancing with Alex.