In the final episode and series finale, Biff Jr. steals the arrowhead that Verne was going to use for his "Show and Tell", dooming Verne to have to be in the school play if he does not produce something to display. Verne grouses to his parents, who say that is not so bad and prohibit him from using the DeLorean to seek a quick fix, but Verne does an end run by being Marty's passenger in the DeLorean when Marty studies the age of dinosaurs. Not thinking about the ramifications, Verne takes a dinosaur egg back to 20th Century Hill Valley which then hatches into a brontosaurus. Verne, with the help of Jules and Marty, must hide the fast-growing dinosaur from his family and the rest of the town. The dinosaur is in danger when Biff and Biff Jr. capture it. They, in turn, sell it to Mr. Wisdom, who plans to dissect poor "Tiny" and make much money. Marty and the entire Brown family save the baby dinosaur and reunite him with his mother in prehistoric times, but one of his baby teeth comes loose, to which Doc says Verne can use for Show & Tell without raising suspicion.
(Synopsis courtesy of Wikipedia)

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