After initially disagreeing, Superman let Jon Kent star trek with his own dad, Jor-El.
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However, Jon returned to Lois and Clark about a decade older after just three weeks.
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Superman #10 reveals this was due to a wormhole Jon got sucked into.
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This was caused by the destruction of the Source Wall.
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Ironically, the wall's shattering also allowed Jor-El to find the boy and send him home.
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But, sadly, the issue reveals other threats are now coming for the House of El.
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