Alice and Bob decide to take a trip to the zoo with their friends Charlie and Dave. It starts off as a fairly uneventful occasion, then Dave gets his hand bitten trying to feed the monkeys (despite the incredibly obvious "Please Do Not Feed the Monkeys" sign). Then Charlie accidentally breaks a cage in the Reptile House, releasing a 50-foot anaconda. While the authorities are trying to deal with that situation and people are rushing out in panic, Alice accidentally gets knocked into the bear pit, and now it's up to Bob to figure out some way to rescue her...