Wild Kratts Season 4 Episode 18 - Animals Who Live to be 100 Years Old Episode Title:Animals Who Live to be 100 Years Old.Episode Description:Martin introduces the rest of the Wild Kratts team to his pet fruit fly, Juice. However, since fruit flies only live for a few weeks, Juice soon dies, saddening the Wild Kratts. The gang begins to wonder about animal lifespans and if any animals can live for 100 years or more, so they decide to travel the world in search of the longest-lived creatures. But someone else is also looking for the world's oldest animals-Zach Varmitech, who wants to discover the secrets to long life so that he can live forever. The Wild Kratts must protect the oldest creatures on Earth from Zach's scheme.