6 min read


This profile is meant to be read after the Power Pack team profile.



  • Real Name: Jack Power.
  • Former Aliases: Counterweight, Destroyer.
  • Known Relatives: James Power (Father), Margaret Power (Mother), Julie Power (Sister), Katie Power (Sister), Alexander Power (Brother), Roy Craig (Grandfather).
  • Group Affiliation: Power Pack.
  • Base of Operations: New York City, New York, United States of America.
  • Height: 4’5″ (1.35m). Weight: 66 lbs. (30 Kg.).
  • Eyes: Blue. Hair: Brown.

Powers & Abilities

Jack Power can alter his body’s density. To do so, he mentally increases or decreases the space between his molecules.

By expanding the space between his body’s molecules, Jack can assume a cloud-like form. While in this state:

  • Jack is intangible.
  • He can propel himself through the air in some unknown manner.
  • With concentration, he can thicken this cloud-like form. Say, to conceal his teammates from sight.
  • When in this form Jack can flow through any barrier that isn’t airtight.

When Jack mentally contracts the amount of space between his molecules, his body shrinks to a height of a few inches. Compacting his mass into such a tiny volume makes his body much more durable.

Mass Master of the Power Pack (Marvel Comics)

‘Tis but a flesh wound!

Finally, like all members of the Power Pack, Jack’s body heals itself at a highly increased rate. He can fully recover from broken bones within days and has a high degree of immunity to disease.

With concentration, Jack and his siblings have discovered that they can greatly increase their rate of healing. This allows them to heal grievous injuries or sickness almost instantly.


Jack wears a special uniform (created by the smart-ship Friday), which is stored “Elsewhere” until he commands it to materialize. The costume:

  • Protects him from temperature extremes.
  • Is highly resistant to tearing.
  • Has a transmitter within it that allows him to communicate with Friday.

The costume also has pockets which are actually apertures into an adjacent dimensionOther realms of existence that are not our universe. Jack can store and retrieve objects from the pockets which clearly should not be able to fit within them. The maximum carry capacity of the “magic” pockets is unrevealed.

Mass Master (Jack Power) provides a cloud cover (Marvel Comics)


Jack is a fairly typical looking eight year old boy. He is of average height and build for his age.

Unlike his siblings, Jack has dark brown hair that sits atop his head in an unruly mop, but he still has the Power family’s bright blue eyes.


Jack’s costume is a deep blue unitard that covers him from neck to boot.

The right sleeve of the unitard is pitch black, as well as a stripe that runs down the right side of his body and a square patch that runs from his neck to the middle of his torso. Within the centre of the black patch on his chest, is a stylized picture of a cloud, which reflects his power.

A pair of silver ridged boots completes his costume. The boots are reminiscent of those an astronaut may wear.


Every group has one of “those guys”. The troublemaker. The scrapper. The prankster. Jack is “that guy” in the Power family.

He marches to the beat of his own drummer (no relation), and no one outside of his parents can ever really tell him what to do.

He is loud, emotional, impulsive, arrogant, abrasive and a braggart. And believe it or not, he’s not even a tween yet.

That being said, Jack loves his family dearly. He definitely has a big heart, which he tries to hide from his siblings.

Mass Master of the Power Pack (Marvel Comics) changing into costume


“I’m Mass-Master ! And don’t you forget it !”

“Save your breath, Alex ! If we ignore the brat’s tantrum, she’ll get over it fast enough !”

“Stupid guard ! Foiled again by the great Mass Master !” (The guard didn’t answer “it is an honour to be foiled by the great Hong Kong Phooey“, alas. Stupid guard indeed — Ed.).

“I thought I had a dumb worthless power before, but I think now my power’s the best ’cause I saved everybody !”

“You’ll never catch the great Lightspeed, turkey … but the incredible shrinking Mass-Master can sure catch you — with his 60 pound Jack Hammer special !”

“That’s okay Spidey, we crusading crime crushers have to help each other out !”

“Isn’t it NEAT to have Spider-man for a friend ?”

Mass Master of the Power Pack (Marvel Comics) in cloud form

DC Universe Adaptation

(This section proposes ways of using this character in DC Universe stories).

Jack and his siblings could be imported wholesale into the DC Universe where they would most likely be raised in Metropolis. There they would end up encountering a myriad of superhuman beings, the foremost of whom would be Superman, of course.


DC Heroes RPG

Mass Master

Dex: 03 Str: 01 Bod: 03
Int: 03 Wil: 03 Min: 03
Inf: 02 Aur: 03 Spi: 04
Init: 008 HP: 020


Density Increase: 05, Regeneration: 10, Shrinking: 10, Systemic Antidote: 05

Bonuses and Limitations:

  • Density Increase is Derived from Shrinking (-1FC) and is Always On if Shrinking is active (-1FC).
  • Density Increase has bonus “APs of Density Increase do not subtract from DEX (+2FC) or add to weight (+1FC)”.
  • Density Increase & Shrinking both are Non-Variable (-1FC).


Evasion: 04


Familiarity (Physics), Insta-Change.


Power Pack (High), X-Men (Low), The Morlocks (High), Franklin Richards (High).


Age (Young), Alter-Ego (Cloud Form, Controllable), Power Loss (Lack of Focus, Regeneration is -3CS, Common), Secret Identity.




Thrill of Adventure.






KYMELLIAN COSTUME [BOD 03, Cold Immunity: 04, Dimension Travel (Micro-Tesseract Only): 06, Radio Communications: 25. Bonuses & Limitations: Insta-Change; Radio Communications is Scrambled (+1FC)].

Cloud Form

Jack’s Cloud Form has the same stats as his normal form, but has the following Powers:

Flight: 05, Fluid Form: 10, Self-Link (Fog): 10

Bonuses and Limitations:

  • All Powers are Derived from Self Link (Fog) (-1FC).
  • Fluid Form and Self-Link (Fog) are Always On (-1FC).
  • Fluid Form cannot be used to smother (-1FC).

He also gains the Drawback: Attack Vulnerability (Air based attacks, -2 CS).

Writeups.org writer avatar Bryan Gittens

By Bryan Gittens.

Source of Character: Marvel Comics Series – Power Pack, created by Louise Simonson and June Brigman.

Helper(s): Pufnstuff. For the previous version Adam Fuqua, Chris Cottingham, Pufnstuff, Sébastien Andrivet.

Writeup updated on the 26th of April, 2020.