User blog comment:KidVegeta/Canonicity/@comment-3097771-20101204090422

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Second Coming (yes, that's really the name!) is not canon. There are many timeline discrepencies which, overall, turn this movie the wrong way. Gohan should not have known Goten could turn Super Saiyan. Videl should not have known about the dragon balls (when she doesn't know of them at a later time), and most importantly Goku did not ever meet Goten before his return later during the tournament. However, here, he does (if briefly) meet Goten, and talk to him. Timeline errors are among the most severe canon breaking material, and they can not be overlooked.

Final Ruling: Not canon

note: this is the first movie to have a canon reversal; previously I had listed this movie as canon, but now that is changed to non-canon. -KidVegeta