Dedicating a new submarine, Mr. Incredible is interrupted by the dastardly Bomb Voyage-who is intent on crushing the crowd of onlookers underneath the sub! Mr. Incredible's struggle to save the day has him questioning his Super powers-could something be wrong?

Meanwhile, Bob tells Jack-Jack a bedtime story that has Violet and Dash calling foul: this battle from his glory days seems too amazing to be true. Then, on a visit to the park, Jack-Jack uses his powers to overcome a worthy opponent!