Offspring appears, recovering from outstretching after saving twenty members of Lex Luthor's 'Everyman' hero groups. Lex had deactivated their powers, causing dozens to fall from the sky. During his reappearance he is called "Ernie" by Plastic Man, not Luke. In Week 40, he assists Steel in launching an attack on Lexcorp when Natasha is captured by Luthor. He's later involved with the World War III, beaten by Black Adam, but able to recover fast, even joking with his father about the lack of humour of his superpowered foe, showing the same wisecracking and carefree attitude of his father.
In Countdown to Mystery it is revealed that Ernie is his middle name, and Luke his first name, ending the confusion.