Beast Wars: Transformers S01E26 - Other Voices (Part 2)

The Vok unleash a monstrous weapon, an artificial moon, intending to destroy Earth and all Maximals and Predacons on it. Using a stasis pod equipped with transwarp cells, Optimus flies to the moon to destroy it, but Megatron deviously seals the pod shut, causing Optimus to be destroyed along with the moon.