The Transformers power up once more with this 1999-2001 animated series that follows what happens after the "Beast Wars"─as Optimus Primal and the other shape-shifting heroes return to Cybertron, only to discover Megatron has stripped their world of its power and unleashed the villainous Vehicon drones. This new attack, plus the threat of a deadly virus, presents the mighty machines with their greatest challenge ever! 26 episodes on 4 discs. 9 1/2 hrs. Standard; Soundtrack: English.