It’s not easy being the penultimate episode of the season. Viewers often look past it in anticipation of the finale. Some complained that the previous episode of Rebels–“The Forgotten Droid”–was comedic filler that should have aired during the first half of the season. I can see their point, but it’s also nice to have a bit of fun before everthing hits the fan. That episode also introduced the planet Attolon, which is where the rebels have set up a base that last until the Empire finds it.
“The Mystery of Chopper Base” is not filler. If anything, it’s a table-setter for the finale, and possibly the series going forward. Kanan decided that as long as the Inquisitors are tracking himself and Ezra, the rest of the Rebel Alliance is not safe. The plan is for the two of them to take Ahsoka to Malachor, which is the planet Yoda told Ezra about.
First, they must help set up the base. Attolon is not as uninhabited as everyone first thought. It turns into a “monster of the week” episode; albeit one where the text and subtext have great meaning.
Hera is right to be concerned about Kanan and Ezra. It’s never been explicitly stated that Kanan and Hera are a couple, but they’re not, not a couple either. Kanan has only recently come around to the idea of the Ghost crew joining the Rebellion, while Hera is learning there is more to the war than a small band of rebels trying to bring down the evil Empire.
Or maybe I’m projecting again.
As for the episode itself, the six-legged freaks were sufficently freaky. It was cool when Kanan and Ezra Force-tossed Sabine toward the sensor beacon, but couldn’t they just Forced-pulled the beacon toward them?
I’m just throwing it out there, but I’m pretty sure Deiser is dead. But we never saw the body, so she could still be out there. Somewhere. She didn’t pop up in Rogue One. Maybe she’ll be in the series finale of Rebels. Or even the Boba Fett movie.