Transformers: Cybertron - Season 1 (2005)

As Landmine returns to duty, the Autobots begin to investigate the Omega Lock Meanwhile, two new Transformers join the Decepticons.

Scattorshot and Bud use the space bridge to travel beyond Earth's atmosphere. It doesn't take long before they attract a Decepticon attack.

Hot Shot and Red Alert meet the locals of planet Velocitron.

While Autobots and Decepticons carry on their quest for the Cyber Planet Kets, Megatron's lieutenant Starscream is making his own plans.

A newly opened gold mine causes a mountain to collapse, putting the kids' hometown in danger.

The quest for the Omega Lock forces Vector Prime to risk his own life to save his friends.

The search for the Omega Lock escalates, and across the galaxy the Jungle Planet and its denizens start to get involved.

In the depths of the Atlantic, the city of Atlantis holds a grand Transformer secret.

The Autobots track the starship Atlantis to the moon... and so do the Decepticons, leading to a grand battle.

The Autobots and Decepticons head to Velocitron, and prepare for the big race that holds the Planet Key as its prize.

The race for Velocitron begins.

The race for Velocitron continues, but on Jungle Planet the Autobot Overhaul undergoes a stunning transformation.

Hot Shot continues training on Velocitron. Summoned to Jungle Planet by a fake distress call, Optimus and Vector Prime are rescued by Leobraker, then forced to fight the Decepticons. Optimus discovers a new power.

On Velocitron Hot Shot passes the third stage of the grand prix, while on Jungle Planet Sideways engineers a fight between the Autobots and the Decepticons.

Override and Hot Shot, with Coby riding along to make adjustments to the Autobot's systems, compete in the final race - but Megatron arrives to steal the Cyber Planet Key. The Omega Lock reveals surprise coordinates.

The kids and Scattershot head to the Arctic to investigate atmospheric disturbances.

Leobreaker finds a kindred spirit in Scourge, hearing of his violent and dark past.

Despite Decepticon treachery, Optimus battles Scourge with the power of teamwork, and Scourge learns a valuable lesson in taking all options into consideration, not just fighting.

The Autobots head off in different directions with boxed decoys of Jungle Planet's Cyber Key, in order to split up the Decepticon forces. On earth, a new transformer is discovered encased in Arctic ice.

The monster-hunting Autobot Crosswise imprisoned an army of Decepticons on Earth... an army Starscream is determined to make his own!

Starcream's Decepticon army reaches out over the Earth.

The kids are in government custody and Starscream's army is gaining ground. What are the Autobots to do?

Megatron returns, and Colonel Franklin reveals a deep secret.

Enraged by the damage done to his friends, Optimus battles Megatron while Vector Prime transports Hot Shot, Red Alert and Scattorshot to a human military base. But will even the power of Primus be enough to save them?

As Starscream continues to gain power, Optimus and Megatron fight to reach the Omega Lock while the Autobot and Decepticon forces continue to battle. Wing Saber arrives, but which side is he on?

The battle continues. Starcsream, grown to immense size and power, crowns himself ruler of the universe. Vector Prime retrieves the Omega Lock. Hot Shot, Scattorshot and Red Alert reach Cybertron, to find it being eaten by bugs.

The battle continues. Optimus combines with Wing Saber to reveal a new power.

Optimus' Sonic Wing Mode and Megatron's Armour of Unicron make them almost equally matched. Vector Prime tips the balance, but has Megatron really been destroyed? The Omega Lock, restored to its rightful place, awakens Primus.

Speaking through Jolt, Primus gives everyone a history lesson and reveals the location of the final Key. In his failed attack on Primus, Starscream loses the Map to Vector Prime. Sideways, followed by the kids, abducts the minicons.

Megatron is back, and his mysterious dark powers give birth to two new threats!

Separated from the Autobots and their Mini-Con friends, Coby, Bud and Lori fight alone against Sideways.

While the Autobots and Decepticons fight on Cybertron, Vector Prime searches for traces of the kids and minicons. As they race to leave the Atlantis, Bud's escape pod hits Sideways - and warps out with the main ship.

As the Autobots make preparations to travel to Gigantion, the kids confront their parents with the truth.

Primus emits a massive power beam to stabilise the black hole - until Starscream absorbs the power, grows to planet size and attacks Primus. Can the Autobots wake Primus in time to fight back?

The Autobots head for the warp-hole leading to the alternate universe where Gigantion rests.

The Autobots reach Gigantion, and discover the odd laws that make gaining the Cyber Key impossible. The inhabitants change their minds when Megatron, guided by Soundwave, arrives.

Megatron is upgraded and given new power thanks to the Giant Planet's cyber key. In the process of finding an adversary worthy of fighting he beats up the Autobots that have been nothing short of problematic to him one by one.

The Autobots split up to head for the inner layers of Gigantion, and Coby reveals his latest creation.

The Autobots split up to search the lower levels of Gigantion for its Cyber Planet Key, while the Decepticons do the same.

The Autobot search teams continue to explore the depths of Gigantion, the Jungle Planet is in danger, and the mystery of Planet X is revealed.

Scourge comes to some tough decisions about himself.

The final Planet Cyber Key lies in the Lemuria at the original, earth-like core of Gigantion. As everyone fights to gain possession of it, Vector Prime gives Optimus a harsh lesson in leadership.

The Omega Lock is primed and ready to save the universe - if everyone can survive Starscream and Megatron's titanic energies as they battle to steal it.

To return the Autobots to their home safely, Vector Prime makes the ultimate sacrifice.

With the black hole causing chaos across the universe, it is time for the children of Primus to unite or be destroyed.

In the dark heart of the black hole, the five planet leaders battle Galvatron for the fate of the universe.

As the Autobots race to save Jungle Planet, Optimus Prime and Galvatron have one final battle.

With the threats of the Decepticons and the black hole at last extinguished, the Autobots must look to the future.

A battle between the Autobots and Decepticons sets off a forest fire.