(This article contains some spoilers for “Zack Snyder’s Justice League,” but only for the two scenes with Martian Manhunter)For regular folks who sit down and watch “Zack Snyder’s Justice League” — as in, not die-hard fans of DC Comics — there’s one brand-new character in the Snyder Cut that will no doubt cause some confusion: That weird shapeshifting green guy who disguised himself as Martha Kent for a scene with Lois Lane, and then had a weird chat with Batman at the end.