Fan CastingMarvel's Fantastic Four: World's Greatest Heroes

In their college years, Riley Richards and Victoria von Doom use their opportunity to try an experiment, but it goes wrong, leaving Victoria believed to dead. Twenty years later, Riley grew up to be a scientist and she decides to make a test flight into space using an experimental rocket of her own design. Her boyfriend, Samuel Storm, his younger sister Jenny, and Riley’s college friend, Bea Grimm, all insisted on joining Riley on the flight. Once in space, the rocket was bombarded by a wave of cosmic radiation, and the craft crashed back down to Earth. Emerging from the ruins of the spaceship, they discovered the radiation had mutated their bodies and had given them remarkable new abilities. Riley gained the ability to stretch her body and limbs, Jenny was able to fly and become engulfed in flames she could control, and Sam was able to bend light around his body and become invisible. Bea gained incredible strength and durability, but her body was tragically transformed. She now had a muscular orange, rock-like hide. They are later captured by Victoria's women, who pose as Marines, and meet villainous monarch Dr. Doom.