Power Pack

The team along with Franklin Richards, appeared in the season 2 episode "Support your local sky father"

History
Alex, Julie (Lightspeed), Jack (Mass Master), and Katie (Energizer) Power were four fairly normal kids whose scientist father discovered a new power source. Very efficient and ecologically clean, it had the potential downside of destroying whatever planet it was on.

The night before the generator was due to be tested, Aelfyre Whitemane (a member of the alien race known as the Kymellians) crash landed not far from the Power's home. The kids investigated and met a mortally wounded Aelfrye. He explained how his home planet of Kymellia was destroyed by the same device the children's father had built, and how his conveyance, the sentient SmartShip Friday, had been shot down by an alien race called the Zn'rx or Snarks who coveted the device for it's aforementioned planet destruction capabilities. Aelfrye also revealed that his species has certain abilities over fundamental forces, and that these abilities could be passed from one person to another at the point of the first person's death. Aelfrye split his powers evenly between the four children, and commanded his SmartShip to watch over them.

Meanwhile, the Snarks kidnapped their parents. Using their knew found powers of gravity manipulation (Gee/Alex), acceleration and flight (Lightspeed/Julie), mass (Mass Master/Jack), and energy (Energizer/Katie) the Power kids rescued their parents and defeated the Snarks.

Throughout their history, the kids swapped powers and changed codenames frequently. They couldn't swap powers whenever they wished but only during times of extreme stress and they had little control over who got which power. These powers could only be swapped between these four children because these four children received their powers in the same moment and by the same process. There were situations where only one of these kids possessed all of these powers while the other three were powerless. Most notably was when Alex, under the codename, Powerhouse, had all the powers.

Jack Power quit Power Pack[1] to tend to the team's deeply-ill mother, and Julie Power moved to L.A. to pursue an acting career while attending a super human support group known as Excelsior. She had not registered with the Superhuman Registration act. Katie Power once triumphed over the forces of Advanced Idea Mechanics[2], and Power Pack last operated as a team in New Jersey when they fought the supervillains Grizzly and Big Wheel.