  We show that the well known Georgi-Machacek (GM) model can be realized as a
limit of the recently constructed Supersymmetric Custodial Higgs Triplet Model
(SCTM) which in general contains a significantly more complex scalar spectrum.
We dub this limit of the SCTM, which gives a weakly coupled origin for the GM
model at the electroweak scale, the Supersymmetric GM (SGM) model. We derive a
mapping between the SGM and GM models using it to show how a supersymmetric
origin implies constraints on the Higgs potential in conventional GM model
constructions which would generically not be present. We then perform a
simplified phenomenological study of diphoton and ZZ signals for a pair of
benchmark scenarios to illustrate under what circumstances the GM model can
mimic the SGM model and when they should be easily distinguishable.
