Star Trek: The Next Generation: Season 2, Episode 9

2 - 9: The Measure of a Man

Commander Maddox, a scientist who opposed Data's entrance to Stafleet, now wants to dismantle Data in order to study him and create more androids. Data is forced to resign from Starfleet  to avoid a dangerous test.  Captain Picard ends up in a court battle to decide if Data is a lifeform or owned property.