Plot
In season 4, Megatron and other Decepticons are in prison on Cybertron and he sensed The Fallen has awakend and by releasing Megatron and the Decepticons free and commands him to find th All Spark fragments alover earth for he can absorb it's power and he brought Starscream to life and serving him once again. optimus gets new members on his team after Prowl's death. Jolt, Skids and Mudflap
Episodes
Characters
Autobots
- Autobot Team Commander Wingblade Optimus Prime - Futuristic Semi-trailer truck/fire truck
- Autobot Speedster Bumblebee - Sports Supermini
- Autobot One Bot Wrecking Crew Bulkhead - SWAT Assault Truck
- Autobot Field Medic Ratchet - Earth ambulance
- Autobot Super Spy Arcee - Cybertronian car
- Autobot Techno-organic Sari Sumdac - female human
- Autobot Cavalier Rodimus Minor - Futuristic 2008 Dodge Challenger/1969 Ferrari Daytona
- Autobot Ninja Jolt -
- Autobot Pyrotechnics Hotshot - Cybertronian Sports car
- Autobot Field Medic Red Alert - Cybertronian ambulance van
- Indestructible Autobot Warrior Ironhide - Cybertronian minibus
- Autobot Demolitions Brawn - Cybertronian Halftrack
- Autobot Rookie Wreck-Gar - Garbage truck
- Autobot Twins Skids and Mudflap -
- Autobot Heavy Firepower Warrior Omega Supreme - Autobot Spaceship Ark (much larger than before)
Autobot Council
- Autobot Vice-Magnus Alpha Trion
Autobot Elite Guard
- Autobot Supreme Commander Ultra Magnus - M982 Heavy Expanded Mobility Tactical Truck
- Autobot Elite Commander Sentinel Prime - Snowplow truck
- Autobot Elita Ninja Jazz - Futuristic Sports car
- Autobot Super Speed Warrior Safeguard
- Autobot Junior Officer Jetfire - Cybertronian jet
- Autobot Junior Officer Jetstorm - Cybertronian jet
- Autobot Elite Security Warpath - Cybertronian tank
- Autobot Elite Swordsman Sideswipe - Cybertronian Sports car
Dinobots
- Dinobot Leader Grimlock - Mechanical Tyrannosaurus
- Dinobot Smasher Snarl - Mechanical Triceratops
- Dinobot Bombardier Swoop - Mechanical Pteranodon
- Dinobot Brute Slag - Mechanical Stegosaurus
- Dinobot Defender Sludge - Mechanical Brachiosaurus
Cybertron Intelligence
- Autobot Intel Agent Cliffjumper - Cybertronian car
Autobot Ministry of Science
- Autobot Scientist Perceptor - Cybertronian Pickup / Mobile Laboratory
- Autobot Mechanical Engineer Wheeljack - Cybertronian rally race car
Decepticons
- Decepticon Tyrant Megatron - Tiltrotor gunship
- Decepticon Deep Cover Spy Shockwave - Cybertronian tank/Assault tank
- Decepticon Berserker Blitzwing - Dual-barreled assault tank/Swing-Wing Fighter jet
- Decepticon Thug Lugnut - Futuristic combo Bartini Beriev VVA-14/B-29 Superfortress/Heinkel He 111
- Decepticon Trickster Blackarachnia - Techno-organic spider
- Decepticon Commander Starscream(reborn)
- Decepticon Captain Brawl - Tank
- Decepticon Bounty Hunter Lockdown - Muscle car
- Decepticon Sonic Warrior Soundwave - Scion xB
- Decepticon Espionage Laserbeak - Flying V Electric guitar
- Decepticon Worrior Demolisher
- Decepticon Weapons Specialist Swindle - Hummer
- Decepticon Scout Barricade - Police Car
- Decepticon Mutant Madman Waspinator - Techno-organic wasp
- Decepticon Mass Destruction Warrior Trypticon (with a moving tail and same size as Omega Supreme) - Decepticon Warship Nemesis
Starscream Clones
- Decepticon Coward Skywarp - Sukhoi Su-47 Berkut
- Decepticon Egomaniac Thundercracker - Sukhoi Su-47 Berkut
- Decepticon Sycophant Sunstorm - Sukhoi Su-47 Berkut
- Decepticon Liar Ramjet - Sukhoi Su-47 Berkut
- Decepticon Air Commander Slipstream - Sukhoi Su-47 Berkut
- Decepticon Lazy Thrust - Sukhoi Su-47 Berkut
- Decepticon Ideal Acid Storm - Sukhoi Su-47 Berkut
- Decepticon Couraged Dirge - Sukhoi Su-47 Berkut
Constructicons/Devastator
- Constructicon Foreman Dirt Boss - Forklift
- Mixmaster - Cement truck/Bulldozer
- Scrapper - Excavator
- Long Hual - Dump Truck
- Rampage - Bulldozer/ Mechanical Dog
- High Tower - Crane
- Bonecrusher - Pickup Truck
Team Chaar
- Decepticon General of Destruction Strika - Six Wheeled battle tank
- Decepticon Airborne Soldier Blackout - Cybertronian spacecraft/ Blackhawk
- Decepticon Saboteur Cyclonus - Cybertronian jet
- Decepticon Chemical Warfare Oil Slick - Cybertronian Motorcycle
- Decepticon Waste Disposal Spittor - Cybertronian Walker
Voices
- David Kaye - Optimus Prime, Warpath, Grimlock, Cliffjumper, Lugnut
- Bumper Robinson - Bumblebee, Blitzwing, Blackout
- Bill Fagerbakke - Bulkhead, Hotshot,
- Corey Burton - Ratchet, Ironhide, Megatron, Shockwave
- Susan Blu - Arcee
- Tara Strong - Sari Sumdac, Red Alert, Slipstream, Strikaa
- Kevin Michael Richardson - Omega Supreme, Long Hual, Brawn
- Judd Nelson - Rodimus
- Frank Walker - Rampage
- John DiMaggio - Trypticon, Jolt, Sideways
- Fred Tastacore - Rumble, Trypticon, Brawl
- Richard Green - Bonecrusher,
- Gary Cole - Sideswipe
- "Weird Al" Yankovic - Wreck-Gar
- Phil LaMarr - Alpha Trion, Jazz, Jetstorm, Oil Slick
- Tom Kenny - Rattletrap, Jetfire, Skids, Waspinator, Skywarp, Thundercracker, Sunstorm, Ramjet, Scrapper, Starscream, Thrust, Dirge, Acid Storm
- Jeff Bennett - Ultra Magnus, Soundwave(Reborn), Mixmaster
- Townsend Coleman - Sentinel Prime
- Cree Summer - Blackarachnia
- Lance Henriksen - Lockdown
- Fred Willard - Swindle
- John Mariano - Dirt Boss
- Jim Ward - Sludge, Swoop
- Steven Blum - Barricade, Cyclonus
- Dee Bradley Baker - Mudflap, High Tower, Snarl, Slag