@devoidmana: As much as I love the Bardock special episode (which aired before Goku arrived on Namek, so they're in good time to watch it now) it hasn't received the Kai treatment of an accurate dub. As such, I can't really recommend that they watch it in English, and I'm not one to push the Japanese version where it isn't wanted.
If we're now talking about how incomprehensibly large power levels can become with Freeza's 530,000 rating against Nail, take a moment to consider that Freeza at his max power is 120 million while Goku at Super Saiyan on Namek is 150 million. It's a good thing they retired the numbers at this stage.
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