Meet Dig, a caveman with motivational issues.  He’d rather chill out with some ceremonial herb than hunt for meat, frustrating his super-intelligent adoptive family.  But after rebellious Sparky rejects him at her coming-of-age ceremony in favor of a suspicious stranger, Dig realizes he must radically evolve to earn the trust of his tribe and save them from disaster.  A visceral, playful look at the evolution of language, spirituality, and morality, “Modern Man” depicts a familiar family on the brink of the modern era.  (Some sexual content.)