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Overfishing has caused hungry threshers to venture into the city's ports in search of food. Hannah's solution: to lure "zeeks" (pterodactyls) into the harbor in order to scare the threshers off. It works, but the pterodactyls nest in an abandoned building, much to Scharnhorst's consternation. Feeling underappreciated by the city she's supposed to be helping, Hannah decides to return to Wassoon to take them up on a dream job offer. Fearing for her safety, Jack goes after her to convince her otherwise, but finds himself under attack by a monstrous mobile fortress. The fortress' leader is Lars Striker, exiled from the City by the Sea for an attempted coup. Hearing the commotion, Hannah turns around and chases the tank just in time to save the uncooperative Jack from being left to drown by Striker. Now all Jack has to do is convince Hannah to help him save the city that spurned her. (Original air date: January 14, 1994.)