Irish-born director (1929–1997) who directed Tomorrow Is Yesterday, the original Star Trek's first full time-travel story, in which the Enterprise is thrown back to the 1960s.
Michael O'Herlihy was an Irish-born director who worked extensively in American television and made several features for Disney in the 1960s, including The Fighting Prince of Donegal.
His one Star Trek episode is Tomorrow Is Yesterday, written by D. C. Fontana. Flung back to the twentieth century by a black star, the Enterprise is sighted as a UFO and beams aboard the Air Force pilot Captain John Christopher, whose knowledge of the future threatens history. Kirk is captured on an air base before the ship uses a slingshot around the sun to return home.
The slingshot manoeuvre shown here was used again in later episodes and in Star Trek IV: The Voyage Home.