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Originally telecast June 20, 1992, this episode was the third of Next Generation's season-ending cliffhangers. Things begin on a gruesome note when, during an archaeological investigation on Earth, the excavators come across the severed head of Lt. Cmdr. Data. In as much as Data is still alive and well, it is assumed that the decapitated relic represents the remains of a shape-changing alien. While following up this theory, the Enterprise crew passes through a time vortex, catapulting Data back to 19th Century San Francisco. As before, the outcome of this two-part adventure would not be revealed until the series returned for its sixth-season opener on September 26, 1992. Both parts one and two of "Time's Arrow" were based on a story by Joe Menosky and Michael Piller, with Menosky handling the scripting chores for part one.