Integration

[Pravus Prime]

It really, really depended on how they looked and how the figure was in both forms.

Frankly I don't think it's possible to do it without either a lot of cheating (partsforming) to the point that it may as well be two figures.

If it really was no partswapping I don't think it's possible without making one form or the other look like crap. The Teenage Mutant Ninja Turtles had some figures that transformed from human to splinter and human to Shredder and both of them had forms that suffered big time for the mechanics and that was a mostly straightforward change. To do Mumm-ra from mummy to super form would be even harder.