  Maximally $\mathcal{N}$ extended $2+1$ dimensional flat Supergravity theories
exist for a class of super-Poincar\'{e} algebras for arbitrary $\mathcal{N}$.
They have rich asymptotic structures and contain all interesting topological
supergravity solutions in presence of non-trivial holonomy. For the asymptotic
symmetry algebra being a suitable flat limit of the superconformal algebra
$Osp(\mathcal{N}|2;R)$, we have found the $1+1$ dimensional chiral WZW model as
the dual quantum field theory that describes the dynamics of these solutions.
In the Hamiltonian analysis, the reduced phase space resembles a flat super
Liouville theory.
