Baran Flinders and his sister, Selinda, grew up in Australia. After manifesting powers, they were taken in by Dr. Helga Jace and genetically modified. Baran Flinders took the code name Mammoth and settled into a life of crime. He is 6'8 and 2800 pounds. Mammoth became a constant foe of the Teen Titans in Jump City. While Beast Boy refused to change from a gorilla form, the Teen Titans fought Mammoth near Justice Java. Beast Boy ignored orders and refused to help Robin. Mammoth took advantage of the situation and smashed Robin with a body slam. Robin later defeated Mammoth during the attempted robbery of Jump City Bank after a prolonged one-on-one battle. Mammoth later tried to ambush Starfire while she walked through the city reading "A Birdwatcher's Guide to Pelicans" but she fried him without much effort.