High Quality Content by WIKIPEDIA articles! Isaac "Zak" Silver is a supporting character in the independent comic El Muerto: The Aztec Zombie created by Javier Hernandez.Zak is the best friend to Diego de la Muerte, who dies in a car accident and becomes the undead hero, El Muerto. Zak was crushed to hear of his death.In the live-action film adaption, Zak is portrayed by actor Joel David Moore.In El Muerto Zak has been best friends with Diego for some time and shares a small apartment with him in East Los Angeles. Diego is Catholic by faith but has a greatly developed fascination with world religions, especially that of Aztec mythology. Zak is the more skeptical of the two, preferring logic to faith, many of Zak's studies in to world religions are purely scholarly.