'Star Wars Rebels' to end with 'darker' Season 4

This will be a day long remembered: it marked the end of the Rebellion. Sort of. 
Lucasfilm announced here at its Star Wars Celebration event that its only current TV show — the animated series Star Wars Rebels — will come to a close at the end of  season 4.
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Over the final 15 episodes, the story of the crew of the Ghost, who gets pulled into the wider rebellion, will reach a conclusion that was apparently al