Fantastic Four #161 (August 1975) is written by Roy Thomas, with art by Rich Buckler (layouts & breakdowns) and Joe Sinnott (finished art & inks). It's a difficult issue to summarize, because a lot of plot elements are introduced very quickly.
What impresses me is how effectively this is done. Roy's script tosses one thing after another at us every few pages as it continues to build its complex story about interdimensional war. But the tale is still told clearly--we have no trouble keeping track of everything that happens.
As I said, its summarizing the darn thing that's hard. So, as the action is set in three different dimensions, I'm just going to quickly and seperately describe what happens in each dimension.
On our Earth, Reed is putting himself through some Danger Room-style tests, confirming that he is starting to lose his stretching ability. He's reluctant to tell Sue and the other FF members, though he realizes he must before long. But at the moment, he can't find either Ben or Johnny.
He then discovers that glaciers are rapidly moving down from the arctic, threatening civilization with a new Ice Age. This is apparently being caused by the residents of the Fifth Dimension.
No, not these guys:
THIS Fifth Dimension is a world that Johnny had visited some years ago and helped out. But when Reed tunes in a viewer to see what's happening in that dimension, he sees Johnny at the head of an army, apparently getting ready to attack Earth.
How did Johnny end up in that situation? Well, after storming (or rather--flying) out of the Baxter Building in the last issue, he is still simmering from anger over Reed's decision to sell Fantastic Four, Inc. to a conglomerate. He also admits to himself that he's still hurting from his former girlfriend Crystal's recent marriage to Quicksilver.
So he finds an old portal to the 5th Dimension, remembering a girl--Valeria--showed an interest in him when he was last there. But the 5th Dimension is having troubles of their own. Androids built by Reed Richards--that's alternate Reed Richards from the alternate Earth where he became the Thing--are attacking the 5D. After Johnny tussles with one of them, he agrees to help the 5Ders strike back.
Meanwhile, on the alternate Earth, the two Ben Grimms (one is ours, the other is human and married to Sue) still need to find that world's Reed Richards. Leaving Lockjaw to munch on the robots our Ben destroyed in the last issue, Ben, Ben and Sue fly to New York City, where they discover time-displaced dinosaurs and Vikings rampaging about. Ben has an epic fight with a T-Rex.
We soon learn that these time displacements have happened elsewhere. Their source? Well, apparently its being caused by someone on Marvel Earth. Alt. Ben then gasses our Ben unconscious because otherwise approaching army troops would have fired on him.
So Alternate Earth thinks Marvel Earth is attacking them. Marvel Earth thinks the Fifth Dimension is attacking them. The Fifth Dimension thinks Alternate Earth is attacking them. Johnny is with the Fifth Dimension army and our Ben is currently a prisoner on Alternate Earth. And Alternate Reed Richards is still missing after being captured by Akron last issue. (And remember that Akron comes from yet another dimension.)
Got all that? As I said, I'm really impressed with the way this information is fed too us over the course of the issue, allowing us to assimilate it and grasp the big picture, even if we don't yet know who is manipulating events or what their motivation is. The Buckler/Sinnott art is wonderful to look at, especially Ben's fight with the T-Rex.
This puts us halfway through the story arc. Next week, we'll pause from this to look at a Gold Key comic, but we'll get back to the FF two weeks from now.