G.I. Joe

Sins of Our Fathers (2x28)

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Cobra Commander tries to communicate with the creature in the pit at Destro's ancestral home in Scotland and fails. Meanwhile, Dial Tone is discharged from the Joes and is hired to work on a communications project that turns out to be communicating with the creature. Flint is sent to spy on Dial Tone in disguise. Dial Tone gets the machine to work and Cobra Commander tells it to destroy Serpentor... (Destro's "ancient chant" is reversed speech, revealing a humorous message poking fun at the then-relevant backmasking concern when played in reverse.)