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Will there be any relations between the Galvans, and the Kryptonians and the Green Lanterns? Or will there be a reason why the Galvans couldn't save Krypton from destruction? Does the Kryptonians knew about Omnitrix?
A certain grumpy Galvan agreed with Jor-El about Krypton's exploding problem but couldn't do anything to help because:
A) Kyrpton's Ruling Council did not care about the opinion of an outside alien regarding the state of their planet, no matter how intelligent he claimed to be.
B) The planet's totally not evil AI was "debunking" their theories with less than truthful data, which further hurt the two's arguments in the eyes of the council.
To answer your second question: not really. Jor-El was the only Kryptonian who knew about the watch until Superman found out about it with the rest of the League.
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