Zalaz was the jack-lord of a far distant world in the Earth-One universe, and grew dismayed when his love M'La fell into a coma from which she was unable to recover. He soon ascertained that only the Starheart, imprisoned in the heart of an actual star in Earth-Two's dimension, would have the power necessary to revive her. This theft unleashed the alien globe's radiation into his own dimensional plane, drawing the attention of the Guardians of the Universe and specifically Earth-One's Green Lantern who recruited his counterpart and teammate Green Arrow. Zalaz then used the Starheart to extinguish his own life and transmit his energies into M'La. She then returned the globe and became its protector.
Raakj was from the 31st century, himself also a scientist with a criminal disposition. As the Wizard of Odds, Raakj using time traveling technology. Initially rejected by his generations scientific community, he sought fortune and fame in the 20th century using knowledge of the stock market and games to win millions of dollars. Alas, such fortune was worthless in his time, so he brought Green Lantern of Earth-Two and Doiby Dickles to the moon to aid him in a scheme to procure radium from that satellite which he bring back to his time. Instead, he stole a moonstone from a subterranean race warring with fellow inhabitants of the moon, a moonstone that controlled man's minds for five minutes. Returning to his 31st century, his brief grab for power was thwarted by the Lantern who pursued him. After nearly losing his true love, Raakj forfeited the moonstone and surrendered to Green Lantern. Leaving the couple to start a new life, Alan Scott and Doiby returned to their time.