  We examine the collider and dark matter phenomenology of the Standard Model
extended by a hypercharge-zero SU(2) triplet scalar and gauge singlet scalar.
In particular, we study the scenario where the singlet and triplet are both
charged under a single $\mathbb{Z}_2$ symmetry. We find that such an extension
is capable of generating the observed dark matter density, while also modifying
the collider phenomenology such that the lower bound on the mass of the triplet
is smaller than in minimal triplet scalar extensions to the Standard Model. A
high triplet mass is in tension with the parameter space that leads to novel
electroweak phase transitions in the early universe. Therefore, the lower
triplet masses that are permitted in this extended model are of particular
importance for the prospects of successful electroweak baryogenesis and the
generation of gravitational waves from early universe phase transitions.
