This chapter surveys the space of three-dimensional (3D) mobile visualizations, that is, 3D abstract or spatial data on mobile 2D displays or 3D immersive displays. As a playful “case study” a scenario from the film Aliens is used, where the marines are overrun by aliens in the ceiling, as their mobile visualization device fails to show them the height dimension of the space around them. This example is used to illustrate how different mobile and 3D interaction techniques could have prevented the misunderstanding, using both hypothetical descriptions of the improved movie action and a scientific discussion of these scenarios and their implications.