This was filler done right. The episode had a good pace and was exciting and action-packed from beginning to end. The reason for the side-mission also makes sense and we're introduced to an interesting new environment that CW fans will recognize. The episode also seems to open up a new longer arc for TBB that may stretch several episodes as they investigate this new threat. The changes that are happening in the galaxy are further eplored and we get a lot of fun, exciting and charcter-building moments with Hunter, Omega, Wrecker and Echo. All-in-all, a great episode that's opens up more plot for the show.