[2] The second Doctor Polaris, John Nichol, first appeared off-panel in Justice League of America vol.

[4] In "Underworld Unleashed", the Polaris personality sells Emerson's soul to Neron in exchange for increased powers.

Using her mental abilities, Maxima compels Polaris into believing that his alternate personality has reemerged, forcing him into a catatonic state.

[6] In "Last Laugh", Polaris attempts to take control of the magnetic south pole and battles the Justice League.

Convinced that civilization and humanity's free will are obstacles for creating a better Earth, he plans to use the Controller's power and stolen S.T.A.R.

Shortly before "Infinite Crisis", Dr. Polaris appears in Metropolis, seeking Superman's help in battling a more powerful and ruthless magnetism manipulator called Repulse.

They can lift heavy metallic objects, control ferrous particles in the atmosphere, alter Earth's electromagnetic field, fly at subsonic speeds, and project forms of energy related to magnetism.

[13][14] The John Nichol incarnation can create localized magnetic storms in people's brains, killing them instantly.