There was always a twist ending with "The Twilight Zone."The episode, titled "Cradle of Darkness," was part of the less-remembered third version of "The Twilight Zone," which aired on the now-also-forgotten UPN network from 2002 all the way to 2003 (it was canceled after just one season).

In the episode, as you say, a young woman travels to 1889 to kill Hitler as a baby. That young woman was played by a very young Katherine Heigl, who would become famous a few years later for saving lives as Izzie Stevens in "Grey's Anatomy."

I don't want to give away the twist ending in "Cradle of Darkness" because it's still available on DVD for anyone who wants to catch up. I will say, however, that her plan to kill Hitler and prevent the Holocaust doesn't work out. Because it never does. The TV website TVTropes.com has named a whole law after this fact, "Hitler's Time Travel Exemption Act," pointing out that attempts to kill Hitler appear frequently in film and television and never succeed.

Oddly enough, the episode could have been based partly in fact. It is believed (the historical records aren't clear) that, when Adolf Hitler was four years old, he fell into the River Passau in Germany and nearly drowned, before being rescued by a priest.

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