  I will briefly discuss the signatures and discovery prospects of several new
physics models containing dark matter candidates at future lepton colliders. In
particular, I will discuss the two models that, among other signatures, lead to
electroweak gauge bosons and missing energy: the Inert Doublet Model, as well
as the THDMa, a two Higgs doublet model with an additional pseudoscalar that
serves as a portal to the dark sector. Results are mainly based on a Snowmass
Whitepaper arXiv:2203.07913
