Dopey was an accomplice of the Joker in the robbing of Gotham National Bank.
Dopey and Happy went across to the roof of Gotham National Bank with a cable gun. After disabling the bank's alarm system on the roof, as well as commenting that the silent alarm of the Bank was going to a private number instead of 9-1-1, Dopey was shot in the back by Happy, being the first of the thugs to die.
Behind the scenes
Dopey took his callsign from the Dwarf Dopey of Disney's Snow White and the Seven Dwarfs.
The collectable mask for Dopey was depicted with strands of brown hair, yet in the movie itself, it had red hair.