  We compute the spectrum of the category of derived Mackey functors (in the
sense of Kaledin) for all finite groups. We find that this space captures
precisely the top and bottom layers (i.e. the height infinity and height zero
parts) of the spectrum of the equivariant stable homotopy category. Due to this
truncation of the chromatic information, we are able to obtain a complete
description of the spectrum for all finite groups, despite our incomplete
knowledge of the topology of the spectrum of the equivariant stable homotopy
category. From a different point of view, we show that the spectrum of derived
Mackey functors can be understood as the space obtained from the spectrum of
the Burnside ring by "ungluing" closed points. In order to compute the
spectrum, we provide a new description of Kaledin's category, as the derived
category of an equivariant ring spectrum, which may be of independent interest.
In fact, we clarify the relationship between several different categories,
establishing symmetric monoidal equivalences and comparisons between the
constructions of Kaledin, the spectral Mackey functors of Barwick, the ordinary
derived category of Mackey functors, and categories of modules over certain
equivariant ring spectra. We also illustrate an interesting feature of the
ordinary derived category of Mackey functors that distinguishes it from other
equivariant categories relating to the behavior of its geometric fixed points.
