Back in 2018, Rick and Morty was directly responsible for the return of Szechaun Sauce to McDonald's stores around the country.
According To Comicbook.com
Sunday, McDonald's New Zealand added a photo to their social media profiles of a human hand clearly reaching through a portal used by the animation team on Rick and Morty. The hand is then seen holding a McNugget clearly coated with the fabled Szechaun Sauce.
As of right now, the Szechaun Sauce is limited to New Zealand for now but there's a HUGE possibility that they will be bringing it back stateside again. After all, the second half of Season Four is coming VERY soon.