  Superconductivity has been previously observed in magic-angle twisted stacks
of monolayer graphene but conspicuously not in twisted stacks of bilayer
graphene, although both systems host topological flat bands and symmetry-broken
states. Here, we report the discovery of superconductivity in twisted double
bilayer graphene (TDBG) in proximity to WSe$_2$. Samples with twist angles
1.24$^\circ$ and 1.37$^\circ$ superconduct in small pockets of the gate-tuned
phase diagram within the valence and conduction band, respectively.
Superconductivity emerges from unpolarized states near van Hove singularities
and next to regions with broken isospin symmetry, showing the correlation
between a high density of states and the emergence of superconductivity in TDBG
while revealing a possible role for isospin fluctuations in the pairing.
