Martin, Bulldog. Bulldog Martin is a rough-and-tough private eye. He is helped by the racist stereotype Jonah. In later stories a scientist friend gives him pills which grant him invisibility, which he uses to stop corrupt union officials and to recover a stolen ruby.
First Appearance: Adventure Comics #40 (DC), July 1939. 10 appearances, 1939-1940. Created by Bart Tumey.
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