Just in case you're a little lost, I'll explain how this came about.  On the way home from the sparring session, Kami contacted Gohan and told him that a chibi version of Goku was in danger in another timeline.  He couldn't send Goku to save himself because chibi Goku would obviously recognize him... and Goku would probably spill the beans about the future to his chibi self and ruin things, hehe.  So now Gohan's been transported to another timeline to save the day :)
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