
Script error: No such module "Episode list". Also, Blackarachnia (originally Elita One) has been reduced to a minor recurring character, only appearing in one episode of the entire season ("Black Friday"). A sub-plot also focuses on Sari as she searches for her father, while learning that there is no record of her existence of any means. Sumdac in order to build a Space Bridge, hoping to use it to conquer a weakened Cybertron from within. Meanwhile, Megatron, Lugnut, and Blitzwing have captured Prof. The season revolved mainly around the Autobots in the aftermath of Megatron's return, trying to restore the city and their image. This season (having thirteen episodes) began merely two whole weeks after the first season had ended, on April 19, 2008, with the airing of "The Elite Guard", and ended on July 5, 2008, with the two-parter, "A Bridge Too Close". At the same time, the Autobots battle members of Megatron's old crew, including Starscream, Blackarachnia, Lugnut, and Blitzwing, while befriending some of the local humans, including Sari, her father, Professor Isaac Sumdac (who is tricked into helping Megatron) and machine-hating police officer Captain Fanzone. Meanwhile, the Autobots (Optimus, Bumblebee, Ratchet, Prowl, and Bulkhead) learn more about 22nd-century Earth from eight-year-old human Sari Sumdac, who has an encounter with the AllSpark that transforms her security key into a mystical Cybertronian artifact with vast powers. The season's main theme following "Transform and Roll Out" centered primarily around Megatron's return after his defeat during his first battle with Optimus Prime.

The first season (consisting of sixteen episodes) began on December 26, 2007, with its three-part premiere "Transform and Roll Out", and ended on April 5, 2008, with "Megatron Rising, Part 2".
