The Marvel Cinematic Universe just delivered a jaw-dropping surprise with the mid-credit scene in its latest release The Fantastic Four First Steps and fans are already buzzing. After its early release in the US the scene quickly leaked online and instantly grabbed attention across social media. With Avengers Doomsday set to arrive next year this sneak peek has set the stage for what looks like a massive shift in the MCU storyline. The post credit scene features Vanessa Kirby's Sue Storm reading a bedtime story to her son Franklin Richards.