Fantastic Four, Vol. 1

Something has been making the Fantastic Four shrink at random times, and they've been hearing disembodied voices warning them about Doctor Doom. With Ant-Man's help, they shrink themselves down to tiny sizes, allowing them to live in the micro-world of Doctor Doom. Doom soon captures them, but that doesn't keep them from accessing the mind of Reed Richards. It is not long before they free themselves and leave in pursuit of Doctor Doom.