The GaLAxy Cluster Evolution survey (GLACE) is aimed to study the evolution of emission line galaxies in clusters across the cosmic time. It takes advantage of the tunable filter mode of OSIRIS (first light instrument of GTC) to scan Hα/[N II], Hβ, [O II] 3727 and [O III] 5007 searching for star formation activity and AGNs in clusters in three different redshift windows ({z˜ 0.40}, 0.63, and 0.86), providing a unique view of the evolution of cluster galaxies along such redshift range. Moreover, the OSIRIS large field of view (8{×}8 arcmin2) together with GTC large collective area ({D˜ 10 m}) make it possible to detect SFR ˜ 2 M_ȯ yr-1 in an angular area up to 2R_vir. We present here the first results of the program together with a brief description of this novel technique focusing in the cluster CL0024+1654 (z ˜ 0.39).