The Transformers (1984)

S2E39 The Key to Vector Sigma (1)

The Decepticons obtain the Key that grants them entry to Vector Sigma. Upon activating Vector Sigma, they discover the Key can also transform organic beings into machines. With ambitions to wield it against Earth, Megatron gears up for a significant showdown. The Autobots realize they will need new allies for this fight, but the process of creating these allies will demand a steep sacrifice.