  In this work, we revisit the end-of-the-world (EOW) brane amplitudes in JT
gravity from a BF gauge theoretic perspective. Observing and identifying the
correct group theoretic ingredient for a closed EOW brane as a discrete series
character, we use the group theory framework as a guide towards formulating the
analogous supersymmetric problem. We compute these amplitudes explicitly in the
supersymmetric generalizations of JT gravity ($\mathcal{N}=1,2,4$), motivated
by the prospective of possibly finite amplitudes. In the process, we develop
some of the representation theory of OSp$(2\vert 2,\mathbb{R})$ and
PSU($1,1\vert 2)$, relevant for the $\mathcal{N}=2$ and $\mathcal{N}=4$ cases.
