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Mass Master of the Power Pack (Marvel Comics)

Mass Master

Power Level:
Game system: DC Heroes Role-Playing Game


If you are not well familiar with 1980s Power Pack, you should first read our Power Pack team profile for context.


  • Real Name: Jack Power.
  • Former Aliases: Counterweight, Destroyer.
  • Marital Status: Single.
  • 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, New York, United States of America.
  • Height: 4’5” Weight: 66 lbs.
  • Eyes: Blue Hair: Brown


Powers & Abilities

Known Superhuman Powers

Jack Power has complete mental control over the density of his body’s mass.

This control doesn’t operate in the same manner as other density manipulators (such as the Vision or the Martian Manhunter). Instead Jack alters his density by either increasing or decreasing the amount of space between the molecules of his body.

The result of such action is that his actual amount of mass remains the same, instead it is either compacted in a single location or spread wide across a larger area.

Send in the clouds

When Jack mentally expands the amount of space between his molecules, his body takes on a gaseous shape and appearance. In this form, Jack is completely intangible and can propel himself through the air in some unknown manner.


With concentration, he can thicken this cloud-like form in order to conceal his teammates from sight. Under normal circumstances, his “cloud” form retains a human-like shape but this is not a requirement by any means.

Like all forms of smoke, in this form Jack can flow through even the most minute cracks in doors, walls, windows; if air can traverse the barrier so can Jack.

Small but punchy

When Jack mentally contracts the amount of space between his molecules, his body become greatly reduced in size. At his smallest, he is no more than a few inches tall. This shrinkage does nothing to affect Jack’s mass, it only compacts it all into a very small volume.

Mass Master (Jack Power) provides a cloud cover

As a result, his body becomes much more resistant to injury when he shrinks. Through the clever use of his ability to expand and contract his mass suddenly, Jack has created an attack all of his own; the “Jack Hammer”. He first flies either above or towards an opponent at his top speed in his cloud form, and then sudden contracts his mass.

This causes him to suddenly become solid and hit his opponent with his entire body weight in a focused area of his body (usually their head).

The kids are alright

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 increase their rate of healing exponentially. 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 and has a transmitter within it that allows him to communicate with Friday.

The costume also has pockets which are actually apertures into an adjacent dimension. 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 currently unknown.


(A general history of the Power Pack can be found in the team’s own writeups.org entry.)


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 trademarked bright blue eyes.

Despite his best intentions, Jack stands out amongst the family. One only has to take a single look into his eyes and you can see the spirit of a natural prankster and a boy that simply can’t sit still.

Mass Master (Jack Power) flying into a duct

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 rogue. Jack is “that guy” in the Power family.

He marches to the beat of his own drummer, and no one outside of his parents can ever really tell him what to do. He is loud, emotional, impulsive, arrogant, abrasive and a bit of a braggart. And believe it or not, he’s not even a tween yet.

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



“No way punk ! 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 !”

(Regarding the look of his costume) “And little silver booties ! Isn’t that sweet ?… For a girl ? I think this is a sissy suit !”

“Stupid guard ! Foiled again by the great Mass Master !”

“All right monster ! It’s you against Mass-Master ! Surrender or — die !”

“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 shinking 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 ?”

DC Universe History

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.


Game Stats — DC Heroes RPG Print Friendly

Tell me more about the game stats

Mass Master

Dex: 04 Str: 01 Bod: 02 Motivation: Thrill of Adventure
Int: 03 Wil: 06 Min: 03 Occupation: Student
Inf: 02 Aur: 03 Spi: 04 Resources {or Wealth}: 001
Init: 009 HP: 020

Damage Capacity (Physical): 03, Damage Transference: 06, Density Increase: 05, Fluid Form: 14, Regeneration: 05, Self-Link (Fog): 10, Shrinking: 10, Systemic Antidote: 05

Bonuses and Limitations:

  • Density Increase is Derived from Shrinking (-1FC).
  • Density increase can only have 1 active AP for every 2 APs of active shrinking (-1FC).
  • Density Increase has the bonus that active APs of Density Increase do not subtract from DEX (+2FC) or add to weight (+1FC).
  • Fluid Form is actually a gas rather than a liquid.
  • Fluid Form cannot be used to smother opponents (-1FC).
  • Fluid Form and Density Increase cannot be used simultaneously.
  • Self-Link (Fog) is Derived from Fluid Form (-1FC) and is Always On when in Fluid Form (-1FC).
  • Self-Link (Fog) does not affect Jack’s vision (+1FC).
  • Shrinking has the bonus Does not affect STR or weight (+1FC).


Familiarity (Physics), Insta-Change.

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

Age (Young), Attack Vulnerability (Air based attacks [only in Self-Link (Fog) form], -2 CS), Secret Identity.


KYMELLIAN COSTUME [BODY 03, Cold Immunity: 02, Dimensional Travel: 10, Flame Immunity: 02, Radio Communications: 25. Bonuses & Limitations: Costume is presumably made up of unstable molecules and changes states as Jack does, Dimensional Travel has the Tesseract Limitation (BC 125) and only allows non-living matter to be stored within it (-1FC); Radio Communications is Scrambled (+1FC) and can only be used to communicate with the Smartship Friday].

By Bryan Gittens.

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

Helper(s): Adam Fuqua, Chris Cottingham, Pufnstuff, Sébastien Andrivet.

Writeup completed on the 20th of October, 2013.

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