"Superman Breaks Loose"
A scientific experiment changes all Kryptonite on Earth to lead. Also, as a fall-out from encountering the explosion, a new creature is created.
"Fabulous World of Krypton: Jor-El's Golden Folly"
Jor-El presses for his discovery of anti-gravity to be used for space travel. Only to see Lara stranded on Wegthor, Krypton's moon, when she stows away on the ship.