Marcus Exeter is the second protaginist of the theme, Custom:The Adventures of Archer Overbuild.
Marcus has always wanted to travel through the Lego Universe. He got his chance at a local competition where he won and received enough money to go. He met up with Custom:Archer Overbuild and they worked together to stop the gangs of Lego City. He later appears in the dojo to train with Archer and in the Land of Chima, in the set, Mount Korra Battle. He appears frequently and is an unlockable in the game Custom:The Adventures of Archer Overbuild:The Videogame.
- Detective work