Four defineately=plus six... Molly in the atomic pile accident..the frozen butler...who went to pieces.....and the two gunmen {who shoot each other} in the zorba the Great episode. In the Batman Movie are six of Penguins henchmen who are KO...one falls into Penguins exploding octotuss and five are rehydrated with unstable atomic water and pop...pop..pop..pop...pop
Note-I think the Batman movie was supposed to come before the series..hence no mention of Batgirl
Ambigious...the policeman who was flash frozen by Mr Freeze and the Policeman who was shocked by the Pengiun hencemen...if they were played by the same actor??? A recurring character.

..also the Fake Commissioner Gordon..shot by a blank or real? ....Remember Batman calls the fake.. a high diver in Bookworms pay...and then of course Catwoman...first falling down the bottemless cavern..and the fall of the warehouse roof into the river...and the teaser at the pilot of the Riddler disapperence...similar to the first comic book of Riddler who tries to trap Batman and Robin in a booby trap maze on a dock but ends up falling into the water himself leaving a "?" {Of course Catwoman and Riddler come back}
ALso in the submarine in the Batman Movie..when the four villians are looking through the periscope...a pussy willow for Catwoman and a ? for Riddler....Penguin probably had a sillouite of either a penguin or himself {with his ego} and Joker...Joker face probably
