  We propose a new dark matter contender within the context of the so-called
``dark dimension'', an innovative 5-dimensional construct that has a compact
space with characteristic length-scale in the micron range. The new dark matter
candidate is the radion, a bulk scalar field whose quintessence-like potential
drives an inflationary phase described by a 5-dimensional de Sitter (or
approximate) solution of Einstein equations. We show that the radion could be
ultralight and thereby serve as a fuzzy dark matter candidate. We advocate a
simple cosmological production mechanism bringing into play unstable
Kaluza-Klein graviton towers which are fueled by the decay of the inflaton.
