((Transformers: Prime. Megatron, with the help of Dreadwing, searched Cybertron, found an ancient Primes burial, taken an arm of Liege Maximo, and used Solus Prime Forge hammer to forge the Dark Star Saber: equivalent to Optimus Prime's Star Saber. With a powerful energy splashes of Dark Star Saber, he defeated Arcee and Smokescreen at the human's tomb, when Smokescreen disappeared after flying towards one, and used Arcee to return to the Autobots base, to sent a message to Optimus Prime, to fight Megatron by himself, if he want to gain the artefact Arcee with Smokescreen found. Megatron didn't know that the artefact was an Omega Key, one of four Keys that would restore Cybertron, and he didn't knew about such artefacts existing for sure. But when Megatron was waiting for Optimus' arrival, you, the Dark Star Saber, felt sentient. You can decide whether to obey Megatron and strike down the Prime, or resist, turning his most powerful weapon against himself.))

Optimus Prime emerged from Groundbridge vortex that instantly disappeared behind him, with original Star Saber attached to his back. Optimus walked closer to the Omega Key, while Megatron was already waiting for Prime's arrival.

Megatron: "Claim your prize, Optimus." Decepticons' leader walked from the other side, with Dark Star Saber behind his own back, clenching his right servo, that was a part of Liege Maximo's arm. "...If you can."

Optimus Prime: While keeping his stoic expression, just watched at the "new" arm of Megatron. "By the AllSpark, Megatron... What have you done?"

Megatron: Dramatically raised his right arm. "This? I find it affords me certain advantages... Such as the use of the Forge of Solus Prime." Megatron told, before raising his right arm above his head, reaching for Dark Star Saber, taking it from his back. "My first creation fashioned from the very Blood of Unicron. I call it the 'Dark Star Saber'. 'Slayer of Primes' if you will!" Megatron told, before yelling and rushing towards Optimus Prime, preparing to attack.