The Skull Man Vol 7

From the Tokyopop edition

With nothing to lose, Rasputin issues a direct challenge to the Skull Man. However, infighting in Rasputin's ranks severely weaken his team and the Skull Man returns to his secluded base to meet with Maya and Garo. There he unveils his feat of genetic engineering, Tobioka. But Garo may hold a secret that will unveil important details of a guarded past.

Source: Anime News Network Encyclopedia