The Fantastic Four: First Steps follows Marvel's First Family during a pivotal time in their lives: The pregnancy and birth of Reed and Sue's baby son, Franklin. That also coincided with the most significant challenge the Four had yet faced: Their planet served up as a snack for the intimidating Galactus.

Marvel’s ‘Fantastic Four’ introduces powerful new characters to the MCU, and ends with tease for ‘Avengers: Doomsday’—here’s the ending and post-credits scene, explained.