Abner is a mentally ill henchman of the Joker who fights Batman and Robin during the events of Dark Knight Returns. He is a talented explosives expert. Two-Face commissions him to help with a terrorist attack for ransom, but Abner sabotages the device so the bomb will blow up prematurely and kill him. Batman is able to rescue Two-Face and the bomb explodes inside of a helicopter thousands of feet in the air. Bartholomew Wolper declares that the Joker has recovered from his insanity and releases him from Arkham Asylum, going on to do talk show guest appearances. Abner uses a flying bomb in the shape of a small child to murder an entire studio audience while Joker escapes police custody. They visit a carnival where he assists the Joker in massive slaughter until they are broken up by Batman and Robin. Robin fights Abner on a roller coaster, and he manages to start choking her until he is decapitated by the ride.
- 5 Appearances of Abner (Earth-31)
- 3 Images featuring Abner (Earth-31)
- Quotations by or about Abner (Earth-31)
- Character Gallery: Abner (Earth-31)