The Master Builder turns the limelight over to two fairly new Autobots (at least from the standpoint of the toy-line or when we first saw them in the show, but according to the show they were definitely known on Cybertron), Hoist and Grapple. We also see more activity from the Constructicons, and get to know each of them a bit better. However it is one of the few episodes where Bumblebee is absent, or is he? (see Nitpics below)
This episode also serves as a reflection for today's society: Grapple wanted to build a solar tower, but was denied permission due to political reasons. Environmentalists have lobbied for decades to try to get the governments to switch to solar energy instead of fossil fuels, but politicians have been reluctant, due to political reasons.
Some fun moments in this episode were where Prime, Tracks, Inferno and Smokescreen were playing basketball, after Spike teaching Prime at the start of the show. And then later, when Powerglide called Prime to report on Hoist, Grapple and the Constructicons, Prime was still playing with the basketball, rolling it along his arms. (see the Image Archive for pics of this.)
Nitpics: One big nitpick in this episode, is near the end, when their about to dig Hoist and Grapple out of the rubble of the solar tower, Cliffjumper is given Bumblebee's colors; click here to see a pic. It is still clear that it is meant to be Cliffjumper, given the spoiler that appears across the top of his torso in robot mode; Bumblebee has no spoiler.
Another nitpick, is when the Autobots are approaching the Solar Tower, Inferno is not to be seen at all, when they finally transform to robots, one of the first shots shows Inferno, but none after. Probably meant to have been Ironhide in that shot; here's the pic.
Any other nitpicks for this episode, please forward to firstname.lastname@example.org, or list them in your own review of this episode.