The Autobots find the Allspark and the Decepticons try to seize it.

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

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

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

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

Black Arachnia is desperate to find Wasp before the Autobots.