Spike and Carly arrive on Cybertron, where Shockwave immediately attacks them. They manage to escape, and Sparkplug is able to track their progress via Teletraan I. They eventually get to Wheeljack's lab, but are followed by someone. It's Swoop, who explains that the Dinobots fought against Shockwave's forces, but were eventually captured and taken to the Cybertonium pits. Spike and the others decide to also head there, but eventually find themselves in an old part of Cybertron. Carly manages to get a computer to play a disc, which informs them about the war between the Autobots and Decepticons.

Some of Shockwave's forces then find and capture them, taking them to the pits. There, Carly figures out the that other Dinobots have been reprogrammed to work for the Decepticons, but she changes them back to their usual selves. Grimlock and Spike cause a distraction which makes the guards lower the energy fields, allowing the Dinobots to break out. The guards are destroyed by the Dinobots.

The group head to where Shockwave is, who is preparing to send another shipment of Cybertonium to Earth. Sparkplug tells Spike that Teletraan I has altered the location of the space bridge so it'll now appear to Autobot HQ. Swoop knocks down Shockwave, as he and the rest of the group use the space bridge to return to Earth with the Cybertonium shipment. The Autobots are all saved, and Optimus Prime makes Spike and Carly honorary Autobots. He also thanks the Dinobots, telling them they've done an excellent job. Slag and Snarl admit that whilst they don't like it, they will take orders from Prime now. Grimlock says that is until he no longer feels like it!

Notes

-Spike comments about the energon cubes, wondering how they've gotten there. This is a hint that the Autobots are not managing to stop the Decepticons getting energon to Cybertron 100% of the time, and later episodes will reveal that Megatron isn't just getting energon from Earth.

-We get something new in this episode: actual death! The video file Spike and co watch shows a few Autobots getting blown apart, and the Sentinel who talks to Shockwave gets melted down by Slag. Perhaps the writers were trying to ready children for a certain movie...

-We're not quite halfway through the second season yet, but this is the last time the Dinobots appear in it. I guess Hasbro were happy enough with how many times their toys had been plugged, but it seems they were still some of the most popular characters -they'll return for big roles in the movie, and also make plenty of appearances in season three.

-The Cybertonium shipment Shockwave had ready to send back appears to be energon cubes, just colored green instead of pink. It looks different to the shipment seen at the end of the first part.

-Whilst some Transformers new to the second season appeared in the previous part -like Blitzwing, Powerglide and Hoist -only first season characters appear in this part.

Errors

-The end of part one had Shockwave blast open the space bridge entrance -this is even shown in the recap at the start of this episode. But when the episode actually begins, things are changed so Shockwave just stands there and instead of causing an explosion, his single blast disintegrates Carly's car.
-Shockwave was also shown wielding a weapon that's just a smaller version of his own gun mode at the end of part one, but he doesn't have this at the start of part two.
-Near the end of part one, a shipment of Cybertonium did arrive on Earth, as the Constructicons had started to transport it. But for some reason this appears to have disappeared in part two, as Shockwave has to get another shipment sent out.
-When Spike asks Grimlock to transform, Swoop can be heard grunting for seemingly no reason.
-Slag's face is colored gray instead of red during this shot.
-The above error happens again moments later.