Hyperion #6

There are many Hyperions in the Marvel multiverse, all of them based on DC's Superman. They have usually come to 1 of the parallel Earth's as sole survivor from another world, and get adopted by an Earth family. They are usually powered by the Sun. They are usually vulnerable to argonite, a substance from their planet.

This Hyperion 1st appeared in Avengers (2013) #4 during the slow death of the multiverse that eventually led to Secret Wars. His universe was destroyed by an Incursion - a collision with another parallel universe. He was the only survivor (again), but was pulled into the main Marvel Earth(-616) by AIM, and then joined the Avengers, where of course he worked with Iron Man. After Secret Wars he joined the Squadron Supreme, composed of superheroes like him from Earths that were destroyed in Incursions.

These Incursions were gradually destroying the multiverse. When 2 parallel universe collided the Incursion was centred on their Earths. The only sure way for both universes to survive was for 1 of the Earths to be destroyed during the 1st few hours of the Incursion.
Sub-Mariner was part of the Illuminati who decided to protect Earth-616 by so destroying Incursing Earths if necessary. The only 1 they destroyed was the home of the supehero group the Great Society in New Av (2013) #19-20. Namor was the 1 who pushed the button, and he went on to found the Cabal who would destroy many more in the pages of NAv.
But Dr Spectrum of the GS escaped and is now 1 of the Squadron Supreme on Earth-616. The group decided to take revenge on Namor, and killed him in SS#1. Hyperion struck the killing blow. (The Cabal didn't destroy Hyperion's Earth. His universe died because no-one tried to destroy either of the Earths involved. He just tried to keep them apart.)

Thundra popped in and took the Squadron to Weirdworld in SS#3-5, at the end of which she joined the team and came home with them. She had spent a lot of time with Hyperion, and she joined him here last issue which I think is where they became lovers.

Junior was head of a criminal carnival. He had an alien which gave people superpowers and made them subservient to him (I think). He dubbed this group his Family. Doll really was his daughter, but escaped before she was transformed by the alien.

Tony Stark claims to have discovered sterile neutrinos and used them to create dark radiation. Both of these are known but purely speculative things, and are speculated to be related. (Dark radiation is the dark equivalent of the photons of electromagnetism. Different from dark energy.) So far, so clever of him.
He then says he uses the dark radiation to 'countermand' Hyperion's radiation, which then traps him in a forcefield. Ignoring the dodgy use of the word countermand, I'm not sure what that bit of SF hand-waving means. I interpreted it as cutting Marcus off from the solar photons which empower him.
But I would have thought if dark radiation exists there would be a humongous amount of it all around us, in the same way that there's supposed to be much more dark matter than ordinary matter but it has no effect on us. So dark radiation shouldn't be able to cut off normal radiation, because if it could it would be doing it all the time.

This is the end of the Hyperion series.

Hype and Thundra probably go from here to answer a call from the rest of the Squadron in Thunderbolts #4 (see my synopsis in the Captain America Library). And that issue says it's before Squadron Supreme #8 where Hyperion gets (I think) put out-of-sync with time.