[DS9] Season 3, Episode 11: Past Tense Pt. 1
This episode is mostly stage setting, establishing the interesting segment of Earth “history” the characters are dropped in. Most of the real plot doesn’t kick in until the next episode, but that isn’t enough of a problem to knock this one down from a 3.
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Read more at Memory Alpha
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Notes:

The transporter path goes through some time warp thing and Sisko, Dax and Bashir are transported to the year 2024

For some reason I can accept that they were transported to the past, but I can’t accept that the transporter put them to sleep

In this time period homeless people are grouped together in “Sanctuary Districts” where they have rough living conditions and basically no chance of getting the help they need

O’Brien tries to call the federation but they don’t exist! History has been changed! But there’s some kind of bubble around the Defiant making it so it wasn’t changed whatever

Then Sisko pretends to be the historical figure, even though that means he has to sacrifice his life
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