Mark is a plant NPC in Plants vs. Zombies: Battle for Neighborville. He resembles a Citron wearing the "Orange & Mellow" set and is in charge of hosting Ops for the plants. His zombie counterpart is Monkey.
Mark could possibly come from the acronym for "S.T.E.M.", as the developers could have just thought of a name that started with 'M' for the joke of S.T.E.M.
- His brother is Sergeant Peel.