Bonk

Bonk:bonk was a former member of the jokerz. his last seeing of him was in batman beyond:return of the joker. his final act in the movie was throwing a tantrum then saying he wants out of the jokerz then the second joker a.k.a (tim drake) kills him then he is not seen for the rest of the movie. p.s. ( he is afraid of hights)!

Alternet Future
in the two part epesodes of the show he went under surgery that gave him the evil super powers of turning his hand into a strong mallet like body part.