Time travel themes have been good to Star Trek - especially, in my opinion, The Next Generation. Some of the best TNG episodes (and movies) have dealt with time travel or time anomalies or other thing related to time and Season Two's "Time Squared" was the first full-out time travel episodes (Season One's "We'll Always Have Paris" was the first to throw in a plot element about time though) of many more to come - and boy is it a good one.
Picard and crew find a mysterious shuttle floating around in space - upon retrieving it, they discover that the pilot is in fact Captain Picard himself! Doctor Pulaski learns that it is actually Picard from six hours into the future and Data and Geordi learn from the shuttle's logs that something terrible happens to the Enterprise. Suddenly the fate of the Enterprise, her crew, and her Captain become very uncertain as the situation becomes dire.
"Time Squared" is very well directed by Joseph L. Scanlan, who wields mystery and suspense like a ninja wields a pair of nunchucks, and Patrick Stewart is terrific within a story that takes Picard places he had never gone (and would ever be again) in the series. This is undoubtably one of the finest episodes of Season Two of Star Trek: The Next Generation.