Mr. Mxyzptlk is back, teaming up with the DoDo.  Together, they bring the worlds of the D.C. comics and Loony Toons together.  It's more than just the two stars, the whole worlds interact.  The Flash races Speedy Gonzales and the Road Runner (with Wile E. Coyote right behind).  Green Lantern has to deal with Marvin the Martin.

And more...let's just say that the titles of the miniseries includes "Wast Son of Kwypton" and "The Duck Knight Weturns".

Obviously, this series is long gone, but you might be able to find copies in the collector's Bins (And, if you're listening, DC, this would make a great book reprint).  But if there's a kid still in there, seek it out.  10 Ooos, Baby!