Birdbrain Mary (a.k.a. Krailoni) is an antagonist in Treasure Planet. As the only female pirate in John Silver's crew, her physical alien appearance resembles that of a brain and its stem, only added with a pair of arms, which serve as her only means of walking mobility (however, this does not seem to affect her services to Silver, which involve handling guns or knives). Mary also seems to resemble Yzma, a villain from The Emperor's New Groove. She is also one of the only few pirates to survive during their mutiny, as she is arrested by Captain Amelia and Dr. Delbert Doppler for her crimes alongside the remaining crew.
She is voiced by Mona Marshall.