In the 5th episode of Invincible Season 3, Mister Liu tried to kill Titan because he was unwilling to spring Multi-Paul from prison, and Isotope seemingly betrayed Titan and sided with Mister Liu. Then Mister Liu turned into a dragon and freed Multi-Paul. That’s when it was revealed that Isotope wasn’t a turncoat, because he was instrumental in getting Machine Head out of jail while Mister Liu, Mark, and Atom Eve were busy fighting each other. Isotope took Machine Head to Mister Liu’s limp body, and, after supposedly murdering Liu’s bodyguard, Machine Head shot the boss of The Order, thereby apparently killing his physical as well as his dragon form. Machine Head became the new leader of The Order while Titan, who was very much alive, decided to retire from this life of crime so that he could live peacefully with his daughter, Fiona, and wife, Vanessa.