As Hex seeks the famous Fountain of Youth to restore his youth and thereby his magic, the Tennysons happen upon its presence by accident. Grandpa Max falls into a vat of it at a fair, splashing Ben. While their physical ages revert, so do their mental and behavioral ages, with Grandpa Max wanting to goof around all day while Ben becomes a whiny brat in need of a nap (with all his Omnitrix aliens becoming crabby little kids as well). Will it be enough to stop Hex from gaining the fountain?
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This episode comes with extended opening title credits. See more
Hector says that the effects of the fountain of youth water wear off after awhile, returning those affected back to the previous ages. Hector has been drinking it for 400 year, but when Ben and Max revert to the proper ages after destroying the fountain, Hector distantly waves them goodbye, still a young man and not the dead-of-old-age 400-year-old crone he should be. (Hex, having drunk more later than Max and Ben, is still a toddler.) See more
Now, now, age before ugly.