The kid doesn't buy it, and throws himself into his research with renewed vigor, perfecting his invention with a minimum of design work. Seriously, the thing looks like a giant bullet. It works, though, and he decides to go check out the cavemen. Oddly, we're taken back to the past by a previously unseen narrator, a guy in a green hooded robe. Not sure what his name is. Anyway, he introduces us to a particular caveman who's destined to be the ancestor of half of humanity. Well, until his hunger leads him to the wrong place and he gets killed by a time machine. Fortunately for humanity, the rules of time travel in this particular reality aren't the same as that old comic.
A nice little story, although some of the narration is a bit too cute, trying a bit too hard. In addition to that great time tunnel image, Ditko's version of savagery (something he uses in a lot of his independent work as well) is always a treat.
According to an intereview in ALTER EGO, Steve Skeates wrote this story.