For comedic value I think Freeza and Darth Vader meeting would be hilarious, but that's just me. As for the best cross-over...hmm...maybe Dragonball and Bleach. The similarities between the energy used in db and "spiritual pressure" would make it plausible that the two worlds would fit together. Or something like db and Gundam Wing. The technologies are similar with space travel already written into both as possibilities. That being said, I'm glad there was never a cross-over lol

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