The Decepticons and the Terrorcons go into battle against the Autobots.

Bulkhead awaits a visit from his buddy Wheeljack, but his arrival does not go as planned.

Jack tries to be impressive, with Bumblebee's help, but Knockout's arrivals sends things out of control.

Megatron controls Bumblebee from inside his mind and influences his behavior at HQ.

Airachnid makes a deal with Silas to get revenge against Arcee and Jack.

Starscream makes an unexpected request after he is captured by Optimus.

The Decepticons quickly try to build a space bridge before a prophesied darkness arrives.

The Autobots go to the Earth's core to fight for the planet; and Jack uncovers info about Optimus' background.

The Autobots search for signs of each other, but start to lose hope while the Decepticons welcome a key player to their ranks. A win for Wheeljack may ultimately lead to an Autobot defeat.

As tension builds within the Wreckers, they find themselves confronted with the return of the Predacon.

Soundwave is captured by the Autobots; Megatron revives an old plan.