Considering the effect of western Asian mythology on the foundation of Iranian and Indian mythology, this article aims to compare the myth of Tapehgoz with Zhak's in Ferdosi's epic. Tapehgoz is an invulnerable and cannibal monster of the eighth story of Dadehghot's collection, one of the most Oghuzlar's ancient epic works. This story bears a lot of similarities and congruities with Zhak's. Comprehensive studies are executed on the intertextuality of characters and stories of Ferdowsi's epic with other nations' myths it seems no article has yet investigated the intertextuality of Zhak and Tapehgoz. The present research compares and analyses the congruity of events with theories of Julia Kristiva, Mikhail Bakhtin, Ronald Barth, Harold Bloom, Genet, and Tzvetan Todorov.