  We present Kepler light curves and optical spectroscopy of twenty X-ray
bright stars located in the Kepler field of view. The stars, spectral type FK,
show evidence for rapid rotation including chromospheric activity 100 times or
more above the Sun at maximum and flaring behavior in their light curves.
Eighteen of our objects appear to be (sub)giants and may belong to the class of
FK Com variables, that is evolved rapidly spinning single stars with no
excretion disk and high levels of chromospheric activity. Such stars are rare
and are likely the result of W UMa binary mergers, a process believed to
produce the FK Com class of variable and their descendants. The FK Com stage,
including the presence of an excretion disk, is short-lived but leads to
longer-lived stages consisting of single, rapidly rotating evolved (sub)giants
with high levels of stellar activity.
