Episode 66 is Joe 90 which is the adventures of nine year old Joe McClaine,

who turns superspy after his scientist father (not real father) invents a device capable of duplicating expert knowledge and experience and transferring it to a human brain.

This is another of Gerry Anderson's Supermarionation for 1968, first episode which bares a striking resemblance to 1977 Craig Thomas noval FireFox.