Synopsis
Conan and several Marvel heroes have been sent back in time to the Hyborian Age, chased by a Deathlok who wants to kill Conan for crimes against the time stream. Thulsa Doom has been resurrected by Set cultists who believe they can bring their god to Earth using the blood of Doom and Conan. At the end of last issue Doom captured Conan, and Deathlok remembered that he used to be (a) Miles Morales, Spider-Man. So this issue has 2 stories running in parallel - Deathlok's memories and the heroes' attempt to rescue Conan. I'll separate them out.
1st - Deathlok's fragmented memories:-
In 1 section he's turned into the cyborg and a mystery person gives him the mission to find(?) Conan "or everything you know dies".
But before that Miles was working with Riri Williams (Ironheart) (both members of the Champions but I think no longer the teens they are now). He's taken down Dr Octopus (after what he did to poor dead Peter) but the villain has already launched a drone. And he'd duplicated Reed Richards' dimensional gate (to the Negative Zone) and unleashed the Annihilation Wave on Dallas. A hologram of Riri tells him to wait for backup but Miles suits up as Spider-Man and steps through a portal ...
... which takes him to Dallas where the insectoid horde is pouring through the gate from the Neg Zone. Spidey joins in the battle against them but there are just too many of them. Some of the more humanoid members of the Wave drag him before their lord Annihilus. The villain lifts Miles up by the throat to gloat. But Spidey grabs Annihilus' Cosmic Control Rod off his chest and leaps with it into the Neg Zone gateway. While there he shatters it with a venom blast and the released energy presumably destroys the gate even as it kills *him*.
All the while these memories are playing Deathlok's system is trying to reboot the cyborg personality. But DL resists and we sense that it is Miles who ends up in control.
2nd - Conan and the heroes:-
Thulsa Doom has Conan clamped to a stone X and is preparing to sacrifice him in front of the Set cultists to bring the serpent-god through a mystic portal. Conan wonders if Deathlok's task had been to kill him before he could be used for this end. Then we see the heroes emerging from Cloak's cloak on their rescue mission ...
... unfortunately they emerge somewhere different. They've been using Weapon H's Wolverine senses to track the Barbarian but have just wound up in a Cimmerian graveyard. As they regroup Flash Thompson (Anti-Venom) hits on Dagger, but her partner Cloak isn't happy about that. They face off but Dagger transforms into a 2-swords-wielding warrior woman and separates them. Black Knight tells Elektra/Daredevil he has a plan involving a different facet of Weapon H.
Thulsa Doom tells Conan that he's waiting for the stars of the Serpent to align. But in the meantime he offers Conan a deal. If Conan allowed himself to be transformed into a snake-man then he could serve Set instead of being killed. Conan's answer is what you would expect. Then the rescuing heroes really do arrive, preceded by a load of zombie Cimmerians. Dane Whitman had persuaded Weapon H to transform into the gamma-green supergenius Leader who was able to devise this scheme. He psychically linked Cloak, Dagger and Elektra and the duo combined their life and death powers with Elektra's resurrection magic (courtesy of the Hand) to raise this barbarian army of the dead. The heroes wade into the cultists but Doom slashes Conan's throat and mingles the blood with some from his own hand. And Set comes through the gate.