The Hatrocks begin rifle fireplace on the perplexed Flintstones and Rubbles, and Fred and Barney are compelled to protect their liked types by combating the Hatrocks (with the stone-firing rifles that they have introduced with them for hunting uses), and the Hatrock-Flintstone feud carries on, right up until Pebbles and Slab, the Hatrock newborn, wander away from their respective people and Fred risks his life to avoid the two toddlers from.