Unable to resist the temptation, Kirk Langstrom recreates his serum and uses it on himself. As Man-Bat he seeks out Batman for revenge from their previous meeting. Kirk's wife finally discovers the antidote for the serum, but struggles to find a way to get it to the Batman.
"The Deadly Go-Between"
In a deadly game of doppelgangers, Batgirl must first save a young girl then her father.
Reprinted from Rex the Wonder Dog #3
"The Case of the Gold Dust Death"
Reprinted from GangBusters #30