Kickin' It: Season 3, Episode 4

3 - 4: The Sub Sinker

When self-proclaimed Jerry "The Sub Sinker" Martinez proudly drives away yet another substitute teacher in his Geometry class, the principal is unable to find a replacement, until one man decides to take on the impossible mission - Milton J. Krupnick. Meanwhile, Rudy, Jack, and Kim volunteer to babysit and quickly realize the baby has the martial arts skills of a black belt!