

New characters introduced in season 2 include the Autobots (who was revealed to be Optimus Prime's team's spaceship), and, the Decepticons, the human villain Slo-Mo (who is able to slow down time), and Starscream's army of clones, and (none of the clones are openly referred to by name in the series, the names listed come from the toy-line, while Slipstream was retroactively given her name by Hasbro). This is part of Megatron's plan to invade Cybertron from within, without the Autobots' awareness.

The main theme for Season Two is the discovery of small fragments of the Allspark littered across the city (and possibly, the entire planet), while the Decepticons work on building a space bridge back to Cybertron with the help of Issac Sumdac, who was kidnapped by Megatron in the previous season's finale. While Sentinel completely disbelieves Optimus's claims, Optimus and his team are eventually able to convince Magnus of Decepticon activity on Earth.

Season two The Autobot Elite Guard members, and arrive on Earth to retrieve the Allspark, only to learn of its destruction in the Season One finale.
