  We consider essentially small rigid tensor categories (not necessarily
abelian) which have a faithful tensor functor to a category of super vector
spaces over a field of characteristic 0. It is shown how to construct for each
such tensor category a super Tannakian hull, which is a universal faithful
tensor functor to a super Tannakian category over a field of characteristic 0.
The construction is analogous to the passage from an integral domain to its
field of fractions.
