In the title compound, C(15)H(13)N(5), the N-containing heterocycles are linked by an ethyl-ene spacer in a gauche conformation, the N-C-C-C torsion angle along the linker being 60.1 (3)°. The dihedral angle between the terminal benzotriazole and benzimidazole rings is 39.02 (6)°. In the crystal, adjacent mol-ecules are connected by N-H⋯N hydrogen bonds, forming an infinite chain along the c axis. π-π stacking inter-actions [centroid-centroid distance = 3.8772 (7) Å] between the benzotriazole rings of neighbouring chains extend these chains into a supra-molecular sheet in the bc plane. Weak inter-molecular C-H⋯N inter-actions further stabilize the crystal structure.