Neal Emerson discovered the means to harness tremendous magnetic energies. Assuming a costumed guise, Neal initially attempts to solicit his technique as a means of improving health when, in fact, it splits his personality. An evil side dominates his normal inquisitive nature, as he seeks to achieve greater power and prominence. As the costumed criminal Doctor Polaris, he quickly runs afowl of the law and especially Green Lantern of Earth-One and later Wonder Woman.
Knodar was of the 25th century, and as he was a malcontent thriving on living a criminal life, he stole a metal controller and journeyed to the 20th century to battle the Green Lantern of Earth-Two on several occasions and later Star-Spangled Kid.