It is challenging to visualize the end-user experiences of large and complex systems involving various spatial elements and multiple-user interactions. To support experience prototyping of these systems in the early design phases, we present SketchStudio, a prototyping tool for producing animated design scenarios of large and complex systems. The tool allows designers to specify the user experience over time and space by simply composing a node graph. It instantly generates unique 2.5D animated design scenarios by blending 2D sketches and 3D characters. Further, the tool supports virtual reality mode for immersive views of the created scenario prototype.