cannibal! the musical is a 1993 american independent musical black comedy movie directed, written, produced, co-scored by and starring trey parker in his directorial debut while studying at the university of colorado boulder, before reaching fame with "south park" alongside his friend matt stone who also stars in and produces the movie. it is loosely based on the true story of alferd packer and the sordid details of the trip from utah to colorado that left his five fellow travelers dead and partially eaten. parker stars as alferd packer, with frequent collaborators stone, dian bachar and others playing the supporting roles.