By way of Toonzone, we have a preview to share with you of Transformers Prime Beast Hunters episode 4, Rebellion. Rebellion brings the events of the last three episodes to a head in a massive clash between Autobot and Decepticon at the Decepticon fortress, Darkmount! The preview clip is embedded for your viewing pleasure below.
By way of AT&T U-Verse we also have an extended description for what is happening in the episode:
The Decepticons are in for the fight of their lives when their long-standing fortress comes under the unexpected attack of the vengeful Autobots, who are being led to an anticipated victory by a new and courageous member of Team Prime.