Yes - we get to see Mightor!
Apparently his power came from Omnikron (the big bad of the current arc) but exactly how, we don't know yet.
Yes times two - we get to see Frankenstein Junior!
We also get some fun Blip action, plus a new young cast member named Todd (just a normal kid) and briefly his parents.
We get cave men, in particular a cave man who is nicknamed "Ug" by Todd after Ug saves Todd from an allosaurus! (Although Race Bannon put the finishing touches on the big lizard via a very high-powered rifle.)
We see Deva Sumadi doing important things, and we learn that Benton and Ellen Quest, Ted and Linda Kim-Conroy (parents of Buzz whose best friend is Frankenstein Junior) and Archimedes Zin were all, at one time, lab partners. (Ellen and Ted were both killed in an explosion caused by a saboteur.)
I'm still loving this series. I hope it never ends. I guess some folks may dislike all the back story Jeff Parker is addiing. But the good news is, he's tying various elements together to make a cohesive universe - which might mean, just maybe, an expansion of the line beyond this one comic.
Todd and the caveman are from "Dino Boy and the Lost Valley" though Parker changes his origin. Nice nod to give the last name as Messick. Don Messick was a staple voice actor especially for non-human/animal characters such as Scooby-Doo though he was also Dr. Benton Quest.