Alien Nation: The Udara Legacy (movie, 1997)

Matt and George investigate a series of strange occurrences involving newcomers, who are found to be programmed to carry out someone's dirty work. The method by which they are brainwashed dates back to the slave ship's rebellion group, the Udara, who, we discover, Susan was a part of. Susan and George's lives are further disrupted when Buck enrols in the police academy.