  We investigate support schemes for infinitesimal unipotent supergroups and
their representations. Our main results provide a non-cohomological description
of these schemes which generalizes the classical work of Suslin, Friedlander,
and Bendel. As a consequence, support schemes in this setting have the desired
features of such a theory, including naturality with respect to group
homomorphisms, the tensor product property, and realizability. As an
application of the theory developed here, we investigate support varieties for
certain finite-dimensional Hopf subalgebras of the Steenrod algebra.
