List of Transformers Animated Episodes - Season 2: 2008

With Isaac Sumdac missing (he was actually captured by Megatron at the last minute), Sari has a hard time running his business. The Cybertron Elite Guard (consisting of Ultra Magnus, Jazz, and Sentinel Prime) have arrived on Earth to locate the Allspark. It is eventually discovered that the Allspark wasn't destroyed, but dispersed throughout the city, when a shard of its energy causes an assembly line to go out of control. Meanwhile, Megatron has Isaac begin to construct a Space Bridge so that his Decepticons can invade Cybertron. Following the aftermath, Sumdac System's CEO Porter C. Powell reveals to Sari that there are no records of her birth or adoption meaning that Sari can't prove herself to be the daughter of Isaac Sumdac or that she even exists.

With Sari evicted from Sumdac Tower, Porter C. Powell rehires Henry Masterson (aka "the Headmaster") to help run Sumdac Systems. Henry then decides to test his Headmaster on one of the new Elite Guard bots. Setting his eye on Sentinel Prime, he fakes a Decepticon sighting and takes over Sentinel's body, forcing Optimus and Sentinel to team up to get Sentinel's body back without Ultra Magnus finding out. Meanwhile, Bumblebee and Bulkhead try to be supportive to Sari.

Absent: Ratchet, Prof. Sumdac

Unaware of what Megatron is up to, the Elite Guard begin the removal of Optimus Prime and the other Autobots by sending them back to Cybertron to deal with a Decepticon uprising, yet things take a turn for the worse. Blitzwing and Lugnut steal the Tachyon Transmitter from the Elite Guard's ship for Megatron as part of a way to contact other Decepticons. Meanwhile Starscream returns to life on a garbage barge and returns to take his revenge on Megatron. Megatron destroys him again and again… but a fragment of the Allspark in Starscream's head keeping him alive. Then Starscream tries to entrap Megatron with another fragment of the Allspark which he puts on the electric train. But his attempt fails, thanks to Optimus Prime and his team. The episode ends with Starscream's arrest and imprisonment in the Elite Guard spaceship.

During Detroit's garbage crisis, energy from the Allspark creates a Transformer from a pile of junk. This Transformer, named Wreck-Gar by Angry Archer, causes problems for the city. Crossing paths with Ratchet and Sari (who are working to get Ratchet an attitude adjustment) and Lugnut (looking for Wreck-Gar's Allspark fragment), they all find themselves caught by Porter C. Powell's all-consuming micro-bots, made from Sumdac's nano-tech.

After an encounter with a mysterious blue car that outsped him, Bumblebee competes in Master Disaster's underground racing tournament which ends up getting Blitzwing involved when another Allspark fragment is detected.

After energy from Allspark fragments turns two construction vehicles into Transformers named Scrapper and Mixmaster, Bulkhead befriends them. However, the Decepticons turn the tables on the Autobot's new friends as they want the Constructicons to steal supplies for Megatron's space bridge.

Prowl goes off on his own to capture the fugitive Starscream after the latter escapes from the Elite Guard custody. Alighting on the Moon, Prowl discovers the gaol-breaker and handcuffs him. But he has also a competition: the famed bounty hunter Lockdown. While two tough "hunters" fight each other, their quarry succeeds in running away again. Deciding the only way to take him down is teaming up, Prowl gets caught up with Lockdown's upgrades and intentions. Then Prowl and Lockdown set off back to Earth in pursuit of Starscream. But there they get into a true SNAFU. Unexpectedly, they succeed in capturing two Starscreams at once... Who of them is the genuine one?

Under the orders of a mysterious benefactor, Angry Archer, Nanosec, Professor Princess, and a new villainess called Slo-Mo band together to defeat the Autobots. The Autobots soon discover that the S.U.V.'s mysterious benefactor is the Decepticon arms dealer Swindle. He promises to reward the Villains handsomely if they gain some technical devices for him. Then he is using these devices to create a weapon which can make any machine motionless (including the Autobots) and tries to "flog" it to Megatron. But while he bargains with the Decepticon leader, the Villains, being left rewardless, help Sari to revive Bumblebee and the other Autobots. Bumblebee succeedes in "locking" Swindle in his vehicle mode and in handing him (together with the Villains, indeed) over to justice.

After a mysterious convict escapes Autobot custody, Ultra Magnus contacts the earth-bound Autobots so they can identify him in case he shows up on Earth. Bumblebee recognizes the convict as Wasp, a Bot he ran into back when he was in boot camp and whom he put away in jail in the first place as a traitor. He and Bulkhead then go on, as Bulkhead puts it, "a wild grease chase" to find Megatron's base and nail Wasp at the same time after intercepting a message between Megatron and the mysterious "double agent on Cybertron", who is revealed to be the Decepticon Shockwave, posing as an Autobot named Longarm, who helped Bumblebee frame Wasp.

Blackarachnia has recovered after trying to get the Allspark, and has seduced Grimlock and his team to free Meltdown so he can use his intelligence in the field of genetic modification to purge her organic spider half. Meltdown, however, needs a certain genetic modifier to complete this task, so Blackarachnia blackmails Optimus and Grimlock into getting it by attacking Bumblebee and Prowl and infecting them with her venom. Whether Optimus and Grimlock can work together isn't the only problem, for Meltdown may not be purging the half that Blackarachnia thinks.

While Prowl and Sari practice agility skills, Bulkhead comes wandering in to inquire about the source of a dripping sound that is annoying him. He soon tracks the sound to Bumblebee, who is leaking oil, and Rachet ends up having to use his magnets to free from Bulkhead. Optimus, Prowl, and Sari come in and Prime informs them that Scrapper and Mixmaster have surfaced again. The Autobots take off to find them, leaving a very upset Sari, who gets into all sorts of trouble, behind. While searching for the Constructicons, Bumblebee almost destroys some machinery which he mistook for them. Meanwhile the objects of their search follow Bumblebee's oil trail back to the plant and Sari. Blitzwing, who had been sent to find the Constructicons, finds the Autobots and engages them. In the end, Blitwing is called off by Megatron and the Autobots return to the plant to find that Sari had chased Scrapper and Mixmaster away with the plant's machinery.

Megatron captures Bulkhead in his plan to take over Cybertron after Shockwave mentions that he's a top space bridge engineer. With the threat of using the confiscated Headmaster unit on him and Constructicon assistance, Bulkhead is forced to help. The Autobots plan a rescue party and discover that the Blue Racecar from "Velocity" is actually an Autobot Elite Guard called Blurr.

The Autobots face off against Megatron and the Decepticons to save earth and Cybertron. However, Starscream and his clones attack Megatron's hideout. In the climax of the battle, the Autobot Ship takes on a robot form called Omega Supreme, after which Sari is revealed to have robotic components.