When the planet Dryad was destroyed by a super-nova in the latter half of the 30th Century, six super powered survivors were convinced by the villainous Dark Man that the Legion of Super Heroes was responsible. In fact the Legion had saved most of Dryad's population in an evacuation, but their role was distorted by the Dark Man, and the 6 survivors set out on a path of vengeance.
After the facts were revealed, one of the 6, a sentient creature known as Blok joined the Legion. The other 5 continued to pursue a life of crime without the guidance of the Dark Man, acting individually or as the League of Super Assassins, or occasionally as members of other groups such as the Legion of Super Villains. The other 5 members of the team were; Silver Slasher, Lazon, Titania, Neutrax and Mist Master.