In this talk, we discuss dynamic plasmonic displays and holograms based on catalytic magnesium (Mg) metasurfaces in the visible range. Through the unique hydrogenation and dehydrogenation between Mg and magnesium hydride (MgH2), different information components on the plasmonic metasurfaces become fully addressable in space and can be individually switched on/off. This results in dynamic plasmonic displays and holograms with designated multiple states, giving rise to high-level information control with unprecedented dynamic performance. Our work outlines the inevitable transformation from metasurfaces to metadevices, opening the door to a futuristic research horizon. Such dynamic plasmonic devices will allow for a wealth of applications for high-resolution displays, advanced security labels, high-density data storage and information processing.