While it might be best not to hold your breath for a fourth Back To The Future movie, Christopher Lloyd – aka Emmett Lathrop 'Doc' Brown, Ph.D – is ready for the call, should it ever arrive. And he's got a good idea of what it should be about too, and while illegal betting practices and appropriating Chuck Berry riffs were all well and good, if there's a new adventure for Marty and Doc, it should have a bit more of a message. He told Comicbook.com: “I think somehow it needs to kind of convey a message about something that’s...