Transmogrification (noun)

1. A complete change of form or appearance, especially a surprising or dramatic one.
2. A transformation, especially one that is strange or bizarre.

Origin:

Late 19th century: from french transmogrification, from trans- (expressing change) + mogrifier 'to change the form of' (from latin forma 'form').

Examples:

1. The caterpillar's transmogrification into a butterfly was a beautiful process to watch.
2. The prince's transmogrification into a frog was the result of a wicked witch's curse.
3. The old mansion underwent a transmogrification into a modern hotel.
4. The transmogrification of the once-small village into a bustling city was a slow process.
5. The transmogrification of the superhero into a villain was a surprising plot twist.