Who was originally cast for the voice of Shrek ?
Spin - offs of the " Shrek " film series include the holiday specials " Shrek the Halls " ( 2007 ) and " Scared Shrekless " ( 2010 ) ; a musical adaption ; and the film " Puss in Boots " ( released in November 2011 ) , a spin - off prequel starring the character of the same name who appears in the " Shrek " franchise .