Something's Abyss / The Unbearable Lightness of Being Scooter

a) Scooter invents bungy jumping, which sends Bill falling into Doomsday Cavern. While the Thunderlizards pursue, Bill and Scooter are captured by the cavern's inhabitants and face painful torture, until Bill finds himself set to marry the princess of the subterranean slimey slugs.
b) The Thunderlizards are issued Flechette, a pittosaur to track down the humans. They accidentally find the Thuggasaurs planning to attack Jurassic City with bee bombs from a disguised inflatable dirigible.

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S02E14 - It's a Very Merry Eek's-mas