Sabine and the group will uncover a base in the upcoming episode of "Star Wars Rebels."

Titled "Imperial Supercommandos," episode 7 will follow Sabine, Ezra and the captured leader Fenn Rau as they find out the reason behind their loss of contact with the Protectors of Concord Dawn. However, their probe will lead them to discover a base that is under the control of the Imperial Mandalorians.

In the promo trailer for the episode, Sabine and Ezra are about to capture Rau but are surprised to see Rau seemingly ready to surrender. The group learns that the men of Rau are actually ambushed and are not laying a trap. Sabine asks Rau if the attack was executed by the empire, but Rau says that he believes it was done by the Mandalorians.

A sneak preview for the upcoming episode also shows Sabine and Ezra confronting the Mandalorians. They learn that the opposing group has joined forces with the Empire, so they must accept the fact that they are now outnumbered and outgunned.

In his recent interview with Comic Book, "Star Wars Rebels" showrunner Dave Filoni talked about the alliance of the Mandalorians with the Empire.

"Just what's been going on on Mandalore was something that I never really thought we'd deal with when we started the series," said Filoni.  "Once you deal with her family, you have to say, 'Okay, what's the politics of what's going on there, and how did she wind up an outcast really?' Let's really knuckle down on that. We've said certain things, and we know we have our broad generalizations of it, but what are the specifics of that story?"

"Star Wars Rebels" season 3, episode 7 airs on November 5 on Disney X.