When Bludgeon sabotaged the Autobots' trip to Earth, everyone ended up instead in the middle of Cybertron. And it also turns out that this is where an old dude in metal robes called the Keeper lives. He is guarding, sorta, the head of Primus. Primus—the Transformers' god.

Grimlock doesn't think much of the Keeper, or Primus. He thinks the whole thing is a load of bunk. So, to prove to Grimlock that it is real, the Keeper recounts the origin of the Transformers.

At the dawn of time, two gods—Primus and Unicron—fight. Unicron beats the crap out of Primus on a physical plane, then on the astral plane. In a last desperate ploy, Primus escapes the astral plane into a massive metal asteroid. Unicron does the same, thinking Primus is onto something, and as a result they are both trapped.

Primus eventually learns to shape his prison, and makes it into Cybertron. Unicron shapes his prison into a giant planet-devouring planet that can change into a robot. To combat this, Primus makes a race of little robots called the Transformers. And now Unicron searches the cosmos for Primus, while Primus sleeps to hide from his enemy. The Keeper has just gotten to tell his whole story when suddenly, the Mayhem Attack Squad burst in, shooting him. The Autobots are left at an disadvantage; they have to hold back, to prevent Primus being awoken.

Meanwhile, Scorponok finds his place as Decepticon leader challenged by his men, who are furious he's let Starscream, of all people, back in with them. Mindwipe in particular brings up how Starscream twice almost wiped them all out. Scorponok insists that this way, he is keeping an eye optic sensor on him, and that he can bolster their depleted forces. Starscream himself, listening in from behind a door, is gleeful when he hears the stony silence of the Decepticons, knowing he can use this to his advantage.

On Cybertron, the Autobots are getting slaughtered, as the Decepticons aren't holding back. Bumblebee, frustrated at himself, begs Primus for help, asking if he and his friends must die again prevent the coming of Unicron. Suddenly, he gains a new inner strength, refusing to accept this fate, and charges Bludgeon before he can kill Jazz. Bumblebee, Jazz, and Grimlock, re-galvanised, fight off the Decepticons, with Bludgeon being dragged away by Seawatch, Octopunch being headbutted by Grimlock, and pushed into a hole by Stakeout and Red Hot, and Stranglehold being run into wall by Jazz.
Unfortunately, Octopunch's Pretender shell took the brunt of the fall, and he shoots Grimlock in the back. The shot ricochets off his armored back, right into Primus's face. The shock is enough to wake Primus, causing him to scream. A scream that sent shock waves through the planet. Hearing this, Emarite Xaaron manages to teleport the Autobots to Earth. Grimlock worries about the consequences, but Bumblebee tries to assure him that no one else heard that scream.

Out in deep space, Unicron hears the scream of Primus.

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