Reboot

A reboot is a serial work of fiction that discards the continuity of all previous works within that fiction's franchise (whether it be a movie, comic book, video game, or something else) and starts it over from the very beginning. Normally, this would be considered a hard reboot, whereas a soft reboot simply relaunches the franchise by adding a new installment in it after years of inactivity.

The Smurfs: Reboot
The Smurfs: Reboot is a fanfiction series that attempts to reboot the entire The Smurfs series (presumably the Sony Pictures' live-action movie series) while introducing new characters to its cast.

Expanded AU
The Expanded Animated Universe is considered a soft reboot that simply adds a new season of episodes to those already existing within the 1980s Smurfs cartoon show.