The indole and phenyl ring systems in the title compound, C(18)H(18)N(2)S(2), are nearly coplanar, the indole and phenyl planes forming a dihedral angle of 6.5 (1)°. Supra-molecular aggregation is effected by N-H⋯S, C-H⋯S, N-H⋯π and C-H⋯π inter-actions. The crystal studied exhibited inversion twinning.