Spiderman and Superman (from 1976); Batman and the Incredible Hulk (from 1981) and Uncanny X-Men and the New teen titans (from 2001) as Marvel and DC have a set of crossovers. Fighting bad guys, dealing with real life stuff and occasionally trying to get the girl (though some of the female characters induce a lot of eye-rolling!)

Its fun stuff for what it is and what is best about these characters features a lot. ( )