Atomic Bunny, First Issue (1958)
The first issue (Vol. 1, No. 12) of Atomic Bunny from 1958. How could the first issue of Atomic Bunny be Vol. 1, No. 12 you ask? Simple. In issues 1 through 11, he was known as Atomic Rabbit. When issue 12 came out he had changed his name and the AR on his chest became AB.