The Super Powers Team Galactic Guardians (1985)

The entire Super Powers Team as well as the entire world gathers to grieve over the tragic death of their most powerful hero. Superman has died due to an over exposure to Kryptonite while on a space mission. Firestorm, who was with Superman at the time is hardest hit and most vulnerable. Darkseid captures him and forces the details behind Superman's demise. Meanwhile, some of the heroes journey to the Fortress of Solitude to sort through Superman's things and they learn from one of the robot guards about a Kryptonian trance and that Superman may still be alive, which is great news considering Darkseid has taken over the Hall of Justice and has captured the rest of the Super Powers Team.