In the hope of finally getting to do something normal, Rex stages another breakout, giving Noah and Bobo a lift to the tourist destination of Cabo Luna for spring break. During a volleyball game, he meets and falls for a girl called Circe, who initially wants nothing to do with him. Another chance encounter later leads Rex to discover that she is an E.V.O. with ultrasonic sound powers who is trying to earn the right to join the Pack by defeating an E.V.O. sea monster. While Agent Six, Bobo, and Noah attempt to hold Biowulf and Breach at bay, Rex helps Circe defeat the sea monster E.V.O., and afterward appeals to her to join him at Providence, but she tells him the Pack is the only place she would feel accepted. Even though Rex helped Circe defeat the Sea Monster E.V.O., Van Kleiss lets her join anyway.