Post-credits scene

Sue is reading to a slightly aged-up Franklin, who is maybe 4 or 5 at this point (he was a baby the entire movie). He wants to her to read something else so she gets up to find another book. H.E.R.B.I.E. hands her "The Origin of Species" by Charles Darwin as a joke but she goes to pick out a more kid-friendly book. Then when she’s heading back into the living room she realizes something is wrong, so she gears up to attack and when she turns the corner she sees a hooded Doctor Doom holding his mask talking to Franklin (his back is to the camera so we don’t actually see RDJ’s face).