at the end of 104
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104
There is an episode where trunks returns to the future and kills android 17, 18 and Cell, if that's what you are referring to. Episode: 179 "Free The Future"
The Androids Appear
At episode 287 in Dragon ball Z series.
Trunks does NOT have a girlfriend in Dragon Ball Z. He actually died after the Cell Games. However, I do not know if he gains a girlfriend in Dragon Ball GT or any of the other Dragon Ball series. But I am positive that Trunks does not have a girlfriend in DBZ.