Batman Vol. 1 (1940-2011) #510

Plot

Events become complicated atop Penn Selkirk's penthouse: Batmen old and new fight for the mantle of the bat since Jean-Paul Valley refuses to listen to reason, Catwoman searches for the neural enabler and Robin and Nightwing find themselves caught in the crossfire. Selkirk summons a helicopter to make his getaway, but finds himself joined on it by Catwoman, with the two Batmen dangling from a cable attached to it.