Mason Sackholme is a pre-made Sim from the downloadable neighborhood of Dragon Valley, available from The Sims 3 Store. He is the younger brother to Susie Sackholme. Mason works in the Law Enforcement career track as a Snitch. He has 4 Athletic skill points and 1 Charisma skill point. When first played, Mason is 17 days away from becoming an Adult. At his start, he is friends with Bradan MacGrath and is acquainted with Lorna McCann and Fintan Mithrilen. In addition to sharing the same friends, and fairy blood, with his sister, the two also share the Unlucky trait.
- Mason is a parody of Jason Stackhouse, a character from American television drama series True Blood. However, Jason is the older sibling, whereas Mason is the younger sibling.