Children unwittingly reopen an ancient battle between Autobots and Decepticons.

The children learn more about the history of the minicons and the war.

The Decepticons gain access to the Autobot base and attempt to take the other two minicons.

A new minicon activates inside a highway tunnel.

Grabbing onto Megatron at the end of a battle, Hot Shot and Sideways are transported to the moon.

Decepticons mutiny while searching for MiniCons in a jungle.

A weekend's camping trip to the valley below the dam goes wrong when a violent storm moves in.

Autobot Blurr joins the team, but proves himself not much of a team player.

Megatron plots to destroy the Autobots once and for all.

Megatron uses the Minicons to lure the Autobots into a trap.

Starscream challenges Megatron for control of the Decepitcons.

Trapped with Sideways, Alexis, Rad, Carlos and their minicons become aware of a massive evil entity.

A new transformer enters the solar system.

With Optimus damaged and temporarily out of commission, the newly-arrived Jetfire takes command.

On the moon, Thrust continues his plotting with Megatron.

The massive Tidalwave joins the Decepticons, but is, seemingly, defeated in battle by Hot Shot and Blurr.

The kids try to gather the three Requiem Blaster minicons together.

The minicons want to be in charge of their own destinies, so the kids sneak the new team out of the base.

Desperate to make amends to his old friend, Hot Shot allows Wheeljack to shoot him, but this isn't enough.

Megatron sacrifices Starscream, leaving him to face the Autobots alone.

Hearing Megatron say he is nothing more than disposable cannon fodder, Starscream defects with the Star Sabre.

With Starscream's help, the Autobots infiltrate the Decepticon moon base.

Alexis tracks a minicon in the vicinity of Mars.

Sabre, Shield and Blaster together create the Hydra Cannon.

Optimus and Jetfire attack the ship, but can't stop the Hydra Cannon being deployed.

Hot Shot insists they should take vengeance on the Decepticons.

With the Autobot ship ready to leave, Hot Shot refuses to let the children accompany them.

While the Axalon chases the Decepticon ship, hundreds of minicons appear.

Hot Shot and Red Alert are sucked through a wormhole.

The 'Bots reach Cybertron to find Megatron (now calling himself Galvatron) already winning the war.

While the battle continues, Hot Shot goes to Cybertron to try to convince Galvatron of the impending danger.

Thrust flees into the depths of Cybertron, pursued by Hot Shot and Wheeljack - and, separately, Starscream.

Thrust joins Sideways by passing through a portal underground.

Starscream prepares to do whatever it takes to convince Galvatron the threat of Unicron is real.

As Unicron begins to awaken, Optimus and Galvatron decide to forgo their battle.

The only way to defeat Unicron is to wake the minicons inside him and attack from within as well as without.

The purpose and meaning behind the endless war is revealed.

Thinking Unicron is defeated, Galvatron and Optimus Prime resume their battle.