Transformers
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Season 2
Autobot Spike
Changing Gears
The Autobot Run
The Immobilizer
Day of the Machines
The Core
City of Steel
Traitor
A Prime Problem
Dinobot Island 1
Dinobot Island 2
Autobeserk
Kremzeek
Triple Takeover
The Golden Lagoon
A Decepticon In King Arthurs Court
The Secret of Omega Supreme
Attack of the Autobots
Atlantis Arise!
Enter the Nightbird
Insecticon Syndrome
Master Builders
Microbots
Desertion of the Dinobots1
Desertion of the Dinobots2
Megatrons Master Plan 1
Megatrons Master Plan 2
Blaster Blues
The God Gambit
Make Tracks
Child's Play
The Gambler
Sea Change
Prime Target
Auto Bop
Hoist Goes to Hollywood
The Search For Alpha Trion
The Key to Vector Sigma 1
The Key to Vector Sigma 2
War Dawn
The Girl Who Loved Powerglide
Trans-Europe Express
Masquerade
Cosmic Rust
Starscream's Brigade
The Revenge Of Bruticus
Quest for Survival
Aerial Assault
B.O.T.

THE KEY TO VECTOR SIGMA: Part 1

A Decepticon plan to steal the government's new Super Fuel is thwarted by the Autobots' superiority on the ground. This causes Megatron to bolster his ground forces by having Rumble to steal Earth Cars to rebuild into his new warriors.

Rebuilt as Cybertronian bodies and equipped with super strong automatic force fields as well as antigravity abilities Megatron dubs his new creations the Stunticons. The Stunticons only lack individual personalities, which Megatron can only gain from Vector Sigma.

The Autobots detect the Spacebridge and go to stop Megatron, but they're too late. The Autobots take Omega Supreme to Cybertron. On board are Optimus Prime, Ironhide, Wheeljack, Hoist, Ratchet, and Blaster.

Shockwave informs Megatron that the only known Key to Vector Sigma is held by Alpha Trion. The Decepticons hunt down and find Alpha Trion, procuring the key from him, forcefully.

The Autobots arrive and repair Alpha Trion, who leads them to the path to Vector Sigma.

Megatron and the Decepticons encounter the indestructible Centurion Droids that guard Vector Sigma, but the Centurions obey Megatron once he shows that he has the Key. Megatron orders the Centurions to seek out and destroy the Autobots.

En route to Vector Sigma's chamber the Autobots discover an ancient hanger full of old Cybertronian aircraft. Soon afterward they encounter the Centurion Droids.

Elsewhere, Megatron activates Vector Sigma and the Stunticons receive life. The Stunticons declare themselves as Motormaster, Dead End, Breakdown, Dragstrip & Wildrider. Megatron then returns to Earth with the new Stunticons and the Key to Vector Sigma.

The Autobots fight the Centurions to no avail, and retreat to find another way to stop them. The Autobots find a room full of old drones, which they use to lure the Centurions over a cliff, making it possible for them to reach Vector Sigma.

On Earth, Megatron sets the Stunticons loose on a spree of destruction, while the Autobots discover that they are too late to stop Megatron. The Autobots create new robots using the ancient shuttles.