Fantastic Four, Vol. 1

Thunder in the Ruins - Johnny arrives at Terra Verde and finds Crystal under the influence of Diablo. He fights hard, as do the rest of the FF when they arrive, and their combined efforts keep Crystal, Diablo, and Lockjaw at bay long enough for Diablo's mind control potions to wear off and the current tyrant to cause the destruction of Diablo's base.

What Mad World? - When Lockjaw saved Ben from an explosion in the previous story, they had a little adventure of their own, and met alternate universe versions of the FF.