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[[File:Atlas_(2).jpg|thumb|362px]]A revolutionary compound created by [[Dr Henry Pym]] of [[S.H.I.E.L.D]] that allows the uer to alter their mass, durability, and mass according to the build ingested or inhaled.
Though initially utlised only by S.H.I.E.L.D sanctioned operatives, the Particles have since been stolen and reversed engineered and now see use by a number of agencies that have the resources available.
Users, past and present, include;
[[Ant-Man]], [[Ant-Man II]], [[Atlas]], [[Atom Smasher]], [[Goliath]],
[[Category:Pym Particle Users]]