  We propose a novel realization of the Nelson-Barr mechanism "seeded'' by a
dark sector containing scalars and vector-like quarks. Charge-parity (CP) and a
$\mathcal{Z}_8$ symmetry are spontaneously broken by the complex vacuum
expectation value of a singlet scalar, leaving a residual $\mathcal{Z}_2$
symmetry that stabilizes dark matter (DM). A complex Cabibbo-Kobayashi-Maskawa
matrix arises via one-loop corrections to the quark mass matrix mediated by the
dark sector. In contrast with other proposals where non-zero contributions to
the strong CP phase arise at the one-loop level, in our case this only occurs
at two loops, enhancing naturalness. Our scenario also provides a viable weakly
interacting massive particle scalar DM candidate.
