TF Animated Ep10 - Sound and Fury. (Spoilers)

[MV75]

I thought that he (soundwave), was an experiment on how they key could upgrade a bot to a given design. It worked, it ended up as the final plan, but it had a side effect that megatron didn't foresee, it gave a spark to the robot and allowed it to become self aware. All in all it seemed to be a success for megatron.

And yea, I never thought that megatron intended to personally use soundwave for his own body, I mean, when would megatron want to become a boombox/minivan with zero to none firepower?
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Futura