i don't think goku would really for training his sons anymore. he is too into uub. vegeta, he'll train trunks in a heartbeat. remember, goten is into girls(which ain't bad) and gohan is freaking smarter than most ppl(which isn't bad). imagine super buu(cause uub and fat buu combined) being trained to his full potential; hopefully uub won't turn his back on his mentor though.
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cyclops could possibly beat superman if he absorbs energy from him; then again that might be too much power to handle. I use to dislike the guy cause he was beefing with wolverine but really he is a worthy heroe. he'd actually kill captain american. its a known fact. he could physically fight himself but if that doesn't work then he could just optic blast america.
saiyans really do rock. they're like doomsday but way better. even normal lower class saiyans could beat the average kryptonians. I think supes would be even with nappa but after that nah. he'd even lose to raditz if he put him close to death. also, wouldn't a z warrior's energy ball mess up most comic book characters(including supes, surfer, itachi, spawn, etc.). i don't know if anybody can mess with their agility(fighting techniques) goku can beat anyone/thing. vegito pwns anyone/thing.