Plasmus is Otto von Furth, a super-villain whose body melts anything it touches. Beginning as a miner in Germany, he was accidentally exposed to radioactive elements. General Zahl saved his life by turning him into a monster, and recruited him to the Brotherhood of Evil. This made him an enemy to the Doom Patrol. He has also been a member of the Secret Society of Super-Villains and the Suicide Squad.
Plasmus was created by Marv Wolfman and George Perez, first appearing in New Teen Titans #14. (1981)