Bumblebee is given a mission to Earth by a vision of Optimus Prime. Bumblebee and his team must track down the Decepticons that have been set free on Earth and prevent them from causing any harm.
Overconfidence leaves the Bee Team unprepared when they face a Stunticon that can fire missiles on the ground above a nuclear waste disposal site! (S4, ep 1)
The Autobots' enemy proves more formidable and crafty than they anticipated, using his guided missiles to threaten a nuclear waste disposal site. (S4, ep 2)
Grimlock begs to learn new fighting methods from Drift and puts them into action when the Autobots travel to the Antarctic to battle Prong. (S4, ep 3)
After his actions cause the escape of a Sharkticon, Sideswipe recaptures it to prove his value to the Team in fear of getting replaced by a newcomer. (S4, ep 4)
The Bee Team discovers a mysterious artefact that has a strange effect on Cybertronian minds, turning the bots against one another! (S4, ep 5)
Bee tries to prove he is still cool to his team - with disastrous consequences! (S4, ep 6)
After combining into the Ultra Bee Team Combiner, the Autobots find Sideswipe has split into two individuals! (S4, ep 7)
Strongarm flexes her detective muscles to solve a baffling series of Decepticon thefts. Can she stand up to her teammates in order to bring the thief to justice? (S4, ep 8)
The Bee Team learns about Drift's past when his former mentor, Shadow Raker, comes to Earth to recover something Drift has taken from him. (S4, ep 9)
An experiment accidentally causes the Autobots to swap personalities, leaving them stuck in the wrong bodies. (S4, ep 10)
Strongarm worries that her Academy classmate may still harbour a grudge, but must work with them when the Decepticons attack. (S4, ep 11)
An ancient Cybertronian signal sends Bumblebee and chivalry-obsessed Fixit to a remote English island for a routine scouting mission that turns sour. (S4, ep 12)
Grimlock acquires uncontrollable superspeed, which proves to be a problem when the Autobots have Decepticons to fight! (S4, ep 13)
The Bee Team races to keep the Stunticons from stealing a runaway train's fusion engine and then prevent it from crashing into the Crown City Train Station. (S4, ep 14)
Feeling the Autobots need to step up their game, Bee insists they follow his orders to the letter. (S4, ep 15)
Optimus Prime arrives to recruit Drift for a special mission, sparking a competition between Sideswipe and Strongarm over who'd be better suited to take his spot. (S4, ep 16)
Steeljaw and his pack return and launch an attack on the Scrapyard, forcing the Autobots to abandon their home base. (S4, ep 17)
The tight confines of the caverns has everyone on edge, so Bee goes on a scouting mission, only to be captured by Steeljaw's Decepticons. (S4, ep 18)
The Bee Team struggles to recover a canister with radioactive fuel rods from Steeljaw and his pack. (S4, ep 19)
Prisoner Principles: Strongarm struggles with the correct way to treat a prisoner while also helping the Bee Team keep Steeljaw from wreaking havoc at a nuclear power plant. (S4, ep 20)
Soundwave finally escapes the Shadow Zone to set up a Beacon Generator intended to summon Megatron! (S4, ep 21)
When Underbite eats part of the Autobots' GroundBridge, the Bee Team have to chase the teleporting 'Con through the desert, the forest and even outer space! (S4, ep 22)
After the Energon-seeking WINGCODE infects the Autobots with a virus, Bulkhead joins Grimlock in his frantic hunt for the Decepticon. (S4, ep 23)
The Autobots' pursuit of Steeljaw hits an unexpected roadblock when Strongarm's old mentor arrives from Cybertron with orders to arrest the Bee Team! (S4, ep 24)
When Optimus returns with a dire warning of a Cybertronian invasion of Earth, the Autobots must split up to defend their old home and their new one. (S4, ep 25)
As the Bee Team struggles to liberate Cybertron from the High Council, Optimus and his All Stars fight back the advance force to protect Earth. (S4, ep 26)