Curtis Lum

Elena is drawn to Stefan, a handsome and mysterious new student; Vicki is attacked at a party; Stefan learns that his evil older brother has returned.

Kiera and Carlos visit Roland's farm to investigate a recent bulk purchase of ammonium nitrate, which could be used to make a bomb, but events spiral out of control.

Ben finds a strange sound-emitting device on the North Star that could potentially lead him to Chris.

Maddie rushes to Ryn's rescue after she is taken in for questioning. Ben and Xander return to the deep sea in search of answers, but are met by an uninvited guest.

The military facility is on high alert, and while Chris manages to escape, he is not the only one to make it out.

Ben investigates some suspicious overfishing; Decker increases his efforts to find his escaped mermaid and shows the true extent of his influence.