This episode wasn't complete filler, since it did result in the oft lauded reunification of the Special Most-Awesomest Final Five. But Ellen's return was more than just a return to the ship. It was also a return to Ellen
, which sank this very much into filler territory for me. As both Bill and Saul noted, her return didn't open the doors to any mystical knowledge. She just returned
The true definition of filler, IMO, is an episode that essentially sets up no really new tangents, nor answers any existing ones. This is quintessentially that.
I'll give a more in depth review later, but suffice it to say, this was quite average for nuBSG.