  The observational diversity of ``gamma-ray bursts'' (GRBs) has been
increasing, and the natural inclination is a proliferation of models. We
explore the possibility that at least part of this diversity is a consequence
of a single basic model for the central engine operating in a massive star of
variable mass, differential rotation rate, and mass loss rate. Whatever that
central engine may be - and here the collapsar is used as a reference point -
it must be capable of generating both a narrowly collimated, highly
relativistic jet to make the GRB, and a wide angle, sub-relativistic outflow
responsible for exploding the star and making the supernova bright. To some
extent, the two components may vary independently, so it is possible to produce
a variety of jet energies and supernova luminosities. We explore, in
particular, the production of low energy bursts and find a lower limit,
$\sim10^{48}$ erg s$^{-1}$ to the power required for a jet to escape a massive
star before that star either explodes or is accreted. Lower energy bursts and
and ``suffocated'' bursts may be particularly prevalent when the metallicity is
high, i.e., in the modern universe at low redshift.
