Bat-embargo

Etymology
From, reflecting a morphologic pattern established earlier by such terms as and Bat-signal.

Proper noun

 * 1)  A prohibition against having the same fictional characters appearing in multiple  animated series in the decade of the 2000s, which caused 's allies and enemies save for Batman himself to be unavailable for the animated series ' (although,  and  made appearances in this show) and ', and  to be unavailable for animated series other than .