Arnold is one of Pepper's friends. One night in the summer of 1999, Arnold was nabbed by The Brickster during his evening stroll near the House on Spooky Hill. Pepper and his friend, Luna Rom, later found him in the basement and rescued him with a crane. Arnold was scarred for life and left with a fear of the dark for the rest of his life. The haunted house was demolished the next day. Arnold was captured by the Military of Ogel Prime during the Invasion of LEGO Island.