Slade Wilson was a military man treated with chemicals that granted him access to mental capacities helping him unlock his hidden potential. Becoming an agent-for-hire, Deathstroke the Terminator fullfilled the contracted of his deceased son to defeat the Earth-One Teen Titans including Wonder Girl. While coming close repeatedly, he never quite managed this feat.
Armageddon was an unnamed Nazi agent sent by his superiors to America to unleash biological terror on their hated foes. Using chemicals to unlock a bestial potential in unwitting pawns, such as Major Steve Trevor, brought Armageddon into confrontation first with Earth-Two's Wonder Woman as well as Doctor Mid-Nite. His destructive equipment, including specialized boots allowing him to level city blocks with but a stomp, made him a formidable opponent indeed.
After a series of attempts at vanquishing the Amazing Amazons and their costumed allies, Deathstroke and Armageddon retreated from public view to reignite their illegal reputations through other means.