INFERNO BABIES

A baby, Timmy, was asleep in his bed when demons crept into his room. His parents were killed when the discovered the creatures and Timmy was abducted.
Another infant, Russel, was kidnapped whilst his brother took him for a stroll in the park.
They were returned to N’Astirh’s base, along with three more babies, bringing the total to five. 

X-Terminators #3, New Mutants (1st series) #71

Five more babies were located and brought to N’Astirh, allowing him to enact the first part of the spell that will hold the portal between Limbo and Earth open. A young group of mutants called the X-Terminators confronted N’Astirh but he defeated them before they could save the babies. N’Astirh ordered his minions to locate three more mutant babies, including Nathan Summers.
N’Astirh used the ten babies he had to cast a spell, just as Magik teleported from Limbo. The babies were suspended high in the sky, trapped in an inverted pentagram made of energy that acted as a portal, allowing the demon army to fly through.

X-Terminators #4, New Mutants (1st series) #72

The babies were stuck in the pentagram as the New Mutants and X-Terminators worked furiously to save them. In the end, one of the X-Termintors, Wiz Kid, disrupted the device N’Astirh used to cast the spell. With the spell broken, the babies were freed and the young heroes caught them before they fell. 

X-Factor (1st series) #35

Tracking down Nathan Summers to an orphanage in Alaska, N’Astirh’s minions discovered Jean Grey and Cyclops battling against Nanny and the Orphan Maker. Whilst they were more interested in the fight, the heroes didn’t notice the demons slip in and steal Nathan, along with all the other babies there. 

Uncanny X-Men (1st series) #240-242, X-Factor (1st series) #36-38

Learning that she was a clone of Jean Grey, Madelyne gave herself over to her dark side fully. N’Astirh fulfilled his end of the bargain by handing Nathan over to her. Madelyne decided to sacrifice Nathan and the remaining babies to complete N’Astirh’s plan, but she was stopped by X-Factor and the X-Men. Afterwards, X-Factor were left in possession of thirteen mutant babies. 

X-Factor (1st series) #40

Nanny and the Orphan Maker set their sights on the babies and attacked X-Factor in a bid to get them. X-Factor managed to defeat the villains and the babies were handed over to Freedom Force, a mutant team operating for the government. 

New Mutants (3rd series) #16

Whilst X-Factor believed the babies had been returned to their families or placed in care, many of them were sent to a government testing facility. Using the DNA of the ten babies used in N’Astirh’s spell, a portal between Earth and Limbo was opened. The government set up a base in Limbo, called the Hatchery, where the babies were sent to grow. A team, led by General Ulysses and Doctor Noc, oversaw the operations in a mission called Project Purgatory. For every day that passed on Earth, weeks passed in Limbo and the babies became children. Of the thirteen babies sent to Limbo, eleven survived the ordeal.
After four years in Limbo, a team of soldiers stumbled upon a Bloodstone amulet and brought it back to the Hatchery. Having sensed the amulets presence, Belasco’s daughter Witchfire stormed the base. Believing the babies killed, the soldiers on Earth closed the portal to Limbo off, trapping everyone alive in the Hatchery. 

New Mutants (3rd series) #18

The children had survived the demonic invasion and had actually helped fend it off when their mutant powers began to manifest. Doctor Noc set about patching up the wounded, including one of the children whose face was obliterated during his power manifestation. Realizing that their best chance of survival was to work together, the children and soldiers began to cooperate to find a way out of Limbo. 

New Mutants (3rd series) #15-16

After 26 years in Limbo, General Ulysses and Doctor Noc found their way back to Earth and met up with their superiors. Only four years had passed on Earth, but the government wanted the project scrapped and clarification on the fate of the mutant babies. Ulysses demanded they bring in Magik but, after realizing his superiors wouldn’t co-operate, he decided to enact his plan without their help. Waiting for the X-student Pixie to be away from the X-Men, Ulysses had his soldiers kidnap her so he could use her soul dagger. He returned to his superiors, this time with the now-adult Limbo babies. Showing no mercy, the mutants obliterated the soldiers so that Ulysses could continue with his plan unchallenged. 

New Mutants (3rd series) #17-18

After taking out the soldiers, the mutants guarded General Ulysses as he set about extracting the fragments of her soul from Pixie’s dagger. They were surprised when a portal to Limbo opened up and the New Mutants stepped through it. A fight ensued and Toko easily took Magik’s soulsword off of her before passing her to Shauna, who used her paralysis power to keep her subdued. Alex took care of Karma before the telepath could get inside anyone’s mind. Cypher was targeted by Trista, who used her words to manipulate him until he was under her control. Cannonball squared off against Timothy, before he was captured in Alex’s gelatinous form. Loca fought Moonstar and took great pleasure in breaking the woman’s arm before knocking her out. Sunspot was outmatched by Scab, who remained impervious to the former’s punches. Finally, Magma was knocked out by a blast from Face. 

New Mutants (3rd series) #19

The New Mutants were split up into groups, with the Limbo babies torturing them for their own pleasure. Subdued by Shauna, Karma drifted in and out of consciousness but managed to make contact with the blind, deaf, mute Face. Having acquired the soul fragment from Pixie, General Ulysses had the Limbo mutants load the New Mutants on a shuttle, ready to go into Limbo once more. Ulysses revealed his plan to use the completed Bloodstone Amulet to open a portal, allowing the Elder Gods to destroy Limbo once and for all. Under Trista’s vocal control, Cypher was helpless to resist as he carried his friends onto the shuttle. Having reached Face’s mind and showed him the true horrors of his situation, Karma convinced him to turn on his teammates. Firing off an energy beam, Face killed Timothy and Maw, as well as a number of Ulysses’ soldiers, allowing Karma to escape back to Earth with Magik and Pixie.

New Mutants (3rd series) #20

General Ulysses and the Limbo babies took the New Mutants to the Hatchery in Limbo and prepared to cast the spell. Knowing what would happen if the Elder Gods were unleashed, some of the tribes of Limbo attempted to bargain with Ulysses, but he had Russel killed their emissaries. The other demons weren’t so tactile and they stormed the base, forcing Loca to fight back. She took down a horde of demons, but was killed by Moonstar who shot her in the face with an arrow. Shauna managed to complete the spell, opening the portal and unleashing the Elder Gods. 

New Mutants (3rd series) #21

Instead of destroying Limbo, the Elder Gods tore open a portal to Earth and began laying waste to it. When Ulysses demanded they stop, he was killed instantly. The rest of the New Mutants were freed and Cannonball blew up a shuttle with Doctor Noc and the fleeing Limbo mutants on, killing them all. Having learned how Trista used her powers, Cypher turned them back on her and subdued her. The Elder Gods were eventually stopped by the reality warping Legion, who erased them from existence.