The crew takes a vacation to the late Jurassic period but ends up thwarting a poacher whose unrepentant hunting might threaten all of humanity.

Freshly promoted, Bon takes on the task of saving someone from a neighborhood serial killer. But problems arise when he becomes the suspect.

In 3319 B.C. Sumer, a young boy develops the beginnings of an ancient writing system — but his village is under threat from raiders and needs protection.

Bon and Yumiko travel over 35,000 years back to the desolate landscape of Beringia to prevent a lone hunter from freezing to death on his trek east.