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The metamaterial-enhanced resistive wall amplifier (ME-RWA) is a wideband, high power, vacuum electron device1. In the ME-RWA, the resistive liner of the traditional resistive wall amplifier has been replaced with a lossy epsilon negative (ENG) metamaterial. This work investigated a relativistic, high power microwave (HPM) ME-RWA. Specifically, we examined the feasibility of a 50 MW, L-Band ME-RWA. The investigation of the relativistic HPM ME-RWA includes a theoretical investigation and particle-in-cell (PIC) simulations. In our theoretical analysis, we have modified the traditional resistive wall theory, presented by Birdsall and Whinnery2, to include relativistic effects. To simulate the ME-RWA's performance, we have used the CST Particle Studio software and used homogenous dielectrics with a Drude dispersion response, with the plasma frequency higher than the operating frequency, to emulate materials with negative permittivity. The results of our relativistic ME-RWA theory as well as the results of our PIC simulation will be presented to demonstrate the superior performance of the ME-RWA.