The New Avengers encountered Moridun when he took over the body of M'Ryn the Magus — leader of the Knights of the Infinite, a magical order of Kree-Skrull hybrids who revealed Hulkling to be their prophesied future king. When Moridun attacked them and attempted to devour their souls, repeating the phrase "Life is horror", the New Avengers apparently defeated him — but Moridun planted a seed of his consciousness inside Billy Kaplan's mind and began to slowly infect him. Billy changed his codename from Wiccan to Demiurge, and began to act increasingly amoral. They were alerted to Moridun's survival when the Avengers of the year 20XX came back to the present day through A.I.M.'s new time machine, warning that Moridun would destroy Demiurge's soul completely and use his near-godlike power to almost completely destroy the world. Finding Billy already infected, the future Avengers tried to kill him; instead, with Hulkling's help, Billy was able to recognise Moridun's presence in his own mind and successfully defeat him on the mental plane, expelling Moridun from his body and mind.