....after all, one is part of DC Comics, the other is a member of the Marvel family...
....but, impossible is just a day's work for the Darknight Detective and the Sorceror Supreme!
In Late January, 1997, issue #3 of DC/Marvel All Access came out (by Ron Marz, Jackson Guice and Josef Rubinstein), with a meeting of Batman and Dr. Strange!
This was a set up for the next issue, with a battle of the JLA and the X-Men, but still, Batman and Dr. Strange did meet for a time!
Batman Meets the Marvel Universe
.....and those meetings are detailed here!
Doctor Strange Meets Spider-Manhere!).
When heroes work with heroes, the results are magical!