The Legion of Doom seems to have killed off all the SuperFriends with their deadly Noxium crystal, but it turns out that the "dead" heroes were only android duplicates. We find a similar ending in
"Super Friends": Two Gleeks are Deadlier Than One. Gorilla Grodd and Giganta send a robot version of Gleek to disintegrate the SuperFriends with its laser eyes, but again the SuperFriends that "die" are only androids.