Later , Frederick sends Igor to find a brain and entrusts him with the vital organ , but the henchman drops it , surreptitiously replacing the brain with another .
Igor tries to convince him to continue in his grandfather 's footsteps .
Later , Frederick sends Igor to find a brain and entrusts Igor with the vital organ , but the henchman drops it , surreptitiously replacing the brain with another .
Igor tries to convince him to continue in his grandfather 's footsteps .