Ben 10
S04E03 Don't Drink the Water
After encountering water from the Fountain of Youth, Grandpa Max and Ben are magically turned back into children. This leaves Gwen in charge of looking after them while she also tries to prevent Hex from discovering the fountain's origin.
Season 4 Episodes
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2
3
4
5
6
7
8
9
10
11
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13
Perfect Day
Divided We Stand
Don't Drink the Water
Big Fat Alien Wedding
Secret of the Omnitrix (1)
Secret of the Omnitrix (2)
Secret of the Omnitrix (3)
Ben 4 Good Buddy
Ready to Rumble
Ken 10
Ben 10 vs. Negative 10 (1)
Ben 10 vs. Negative 10 (2)
Goodbye and Good Riddance