I remember seeing a movie (or seeing parts of it) many many years ago (like 10 - 12 years) that I only remember brief scenes from it.
In the movie there was something to do with some TV ad that played that triggered a young girl who was with the protagonists (unsure of why) to go on some killing rampage, and it turned out the TV ad had some hidden message inside it that activated her as a sleeper agent.
I think the people in the movie were able to trace down the hidden message to its origin from an unidentified planet in the middle of the aliens zone.
If I remember correctly, the setting was something like humans are now on another planet fighting barbaric aliens (who make their ships very mad max style I think? Can't exactly remember) but it turns out that these barbaric aliens are the remaining humans who escaped earth after something (I think some corporation... unsure) decided to euthanise everyone on earth.
I recall a scene of the main characters going to earth and walking through the streets passed a diner and a woman (or man... a human) had her face pressed up against the glass and her face was preserved but the rest of her had decomposed (don't remember much more).
Does anyone know what this movie is?