PFJ
Not the JPF ..splitters !
Edited to include painfully obvious but amazingly omitted gag.
Edited to include painfully obvious but amazingly omitted gag.
Sorry to be a pedant but you're both wrong. Batman first appeared in "DC Comics" in March 1939. Robin made his debut in DC Comics a year later in April 1940.
However Batman first appeared in his own dedicated comic, "Batman" in April 1940, in issue #1 of which Joker also made his debut.