  A review is given of the prospects for future colliders and collider physics
at the energy frontier. A proof-of-plausibility scenario is presented for
maximizing our progress in elementary particle physics by extending the energy
reach of hadron and lepton colliders as quickly and economically as might be
technically and financially feasible. The scenario comprises 5 colliders beyond
the LHC -- one each of e+e- and hadron colliders and three muon colliders --
and is able to hold to the historical rate of progress in the log-energy reach
of hadron and lepton colliders, reaching the 1 PeV constituent mass scale by
the early 2040's. The technical and fiscal requirements for the feasibility of
the scenario are assessed and relevant long-term R&D projects are identified.
Considerations of both cost and logistics seem to strongly favor housing most
or all of the colliders in the scenario in a new world high energy physics
laboratory
