User blog comment:KidVegeta/Canonicity/@comment-3097771-20101130084004

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Super Android 13 is not canon. The timeline period of this movie has to be after the android saga, but before Cell saga (Future Trunks was present). Gohan should a Super Saiyan at this time, but was not able to transform (placing it before he went in the hyperbolic time chamber). However, if Gohan could not transform, that means that there is no place for this movie to take place in the canon timeline, and thus is alternate universe. Also, a small detail, but Trunks shouldn't have his sword, as it was already destroyed.

Final Ruling: Not canon -KidVegeta