Jack Stone is a Lego man that has saved a Lego town countless times by taking parts of whatever's on hand to solve problems. He is very positive about trying to solve problems and his catchphrase is "Can Do, Will Do", which turns into "Can Do, Will Do, DONE" when he completes a task. He quickly arrives on the scene when people chant "Can Do, Will Do."
The things he invented include the Heliboat (a small boat/helicopter mix) and a device for lifting buildings and taking them elsewhere.
There are concerns that he caused all the problems that he fixed and he just stands around waiting for someone to chant his catchphrase and then fixes things to be popular with the citizens but he claims this is not the case.
He appears in Nova the Squirrel as a boss in world 4.