Optimus teams up with Sentinel Prime in order to defeat the Headmaster.

Unaware of the Decepticon activity, the Elite Guard take Optimus Prime and the Autobots back to Cybertron.

When the AllSpark turns construction vehicles into Autobots, Bulkhead becomes fast friends. However, the Decepticons have other plans in mind.

The second-rate villains of Detroit team up to beat the Autobots.

While chasing an Autobot traitor, Bumblebee thinks back on the time he spent with Bulkhead in the Autobot Boot Camp.

The Autobots must rally to prevent the AllSpark from falling into the clutches of the Decepticons.

Prowl and Optimus Prime are on the defensive when Lugnut's clones attack Detroit.

Starscream, Lugnut and Blitzwing invade Earth; Optimus Prime makes Sari turn over her Allspark key.

One Autobot has suffered severe damage.

Blackarachnia is desperate to find Wasp before the Autobots.

Ratchet is determined to go to the moon to save Omega Supreme.

Sentinel has success in capturing fugitive Decepticons.

Blackarachnia confronts Bumblebee and Bulkhead as they are celebrating their first Halloween.

Blitzwing and Lugnut come to Earth to help Megatron get the Allspark.

Optimus Prime and his band of Autobots are taken off the job when the Cybertron Elite Guard, led by Ultra Magnus, comes to Earth looking for the AllSpark.

The AllSpark creates a new Autobot out of pieces of garbage.

Bumblebee competes against the Decepticons in an underground racing competition.

Prowl and a mysterious Decepticon bounty hunter go after Starscream.

Unlikely matchups! It's Optimus Prime and Dinobot Grimlock vs. Blackarachnia and Meltdown.

Sari has to defend the Autobot home base from invading Constructicons.

The Autobots try to warn Cybertron of Megatron's spy.

Megatron and the Decepticons focus on conquering Cybertron.

The Elite Guard heads back to Cybertron with prisoners.

Ratchet's old enemy, the bounty hunter Lockdown, resurfaces.

Ratchet and Captain Fanzone are catapulted to Cybertron.