Cromagnon Farce: The Thunderlizards test Dr. Steggy's new photon laser cannon, but the Thuggasaurs take control over it and plan to use it on Jurassic City. Boo Thunder: Scooter invents 'Hollowweed' and instructs Bill to go Tick and Treating, dressed as a jungle slug. Meanwhile, the Thunderlizards are entangled with a fierce battle against the Thuggasaurs' latest invention.—Tom van der Esch