The Joker is an unnamed engineer who quits his job at a chemical company to become a stand-up comedian,
only to fail miserably.
Desperate to support his pregnant , he agrees to guide two criminals through the chemical plant.
During the planning,
the police inform him that his wife has died in a household accident. Grief-stricken,
the engineer tries to withdraw from the plan, but the criminals strong-arm him into keeping his commitment to them.
At the plant, Once inside, they encounter security personnel, the two criminals are killed. The engineer is confronted by Batman who is investigating the disturbance.
Terrified, the engineer jumps into the chemical plant's waste pound lock to escape Batman and is swept through a pipe leading to the outside. Once outside, he discovers to his skin chalk-white, stained his lips ruby-red and dyed his hair bright green. The engineer's disfigurement, compounded with the loss of his family, drives him completely insane and marks the birth of the Joker.