Executioner

The Executioner is a former member of the Masters of Evil.

Biography
In a flashback retold by Wasp to Vision about Wonder Man's origins, Simon Williams was bailed out of prison by the Enchantress and the Executioner, who took him to Baron Zemo, leader of the Masters of Evil, to turn Simon into Wonder Man. Wonder Man defeated the Enchantress and the Executioner in a mock battle and was allowed into the Avengers, who he was suppossed to betray. Wonder Man had a change of heart and helped the Avengers, but the Masters of Evil, including the Executioner, escaped.

The Executioner's current whereabouts are unknown.

Background
The Executioner's flashback appearance is very similar to Wonder Man's first appearance, save that Simon survives as his "death" happens later in the animated universe.