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The Wilson-Morgan hypothesis that fixed mantle plumes rising from deep in Earth's mantle give rise to linear island and seamount chains like Hawaii has been a leading idea in planetary geodynamics for many decades. However, the notion that these ascending columns of buoyant mantle material are fixed relative to each other or to a fixed reference frame has been questioned because the mean regional flow of the mantle (the so-called mantle wind) would be expected to entrain them and waft them about. Lately, even more fundamental questions have been raised regarding the existence of deep mantle conduits. In fact, the subject of plumes has become quite controversial, with important implications for ideas of mantle convection, Earth's differentiation, and planetary magma budgets and cooling.The appearance of Oceanic Hotspots: In trap late Submarine Magmatism and Tectonics is thus timely.