Fantastic Four Cosmic-Size Special

Reed and Ben visit a pocket dimension and bring back some vegetation with them. Though it initially seems harmless, it's proven to be carrying a virus that may be toxic to anyone who hasn't had the same cosmic ray exposure these three have had. Reed doesn't believe it will have a major impact on any of them, but Franklin and Valeria soon notice changes in the ways the adults behave.

This also includes a reprint of "Fantastic Four, Vol. 1 #237."