Long before relocating to Krakoa, the X-Men were prisoners of the living island. With his original team trapped, Charles Xavier needed a new team to rescue them. This apparently came in the form of a new roster which saw the debut of many fan favorites such as Nightcrawler, Colossus and Storm.
However, the students would later find out that this wasn't Xavier's only attempt to liberate the X-Men from Krakoa. He had previously sent a smaller team, that has been massacred by the living island. Though they did manage to free Cyclops, Xavier had the memory erased from the field team leader's mind, to cover up the loss of the team, which consisted of Petra, Sway, Darwin and Scott's own brother, Vulcan. Now, we're taking a closer look at what happened to the forgotten generation of X-Men that debuted in Ed Brubaker and Trevor Harisine's X-Men: Deadly Genesis.
PETRA
Petra is a mutant with the power of Geokinesis, that affords her control over the earth, rock, soil and similar substances. Her powers also have tectonic implications, as she is also capable of causing earthquakes. During the mission to save the X-Men during Deadly Genesis, Petra was one of the two team members who perished. She was incinerated by Krakoa, though she was able to use her final moments to protect Vulcan and Darwin by burying them beneath the ground with the help of Sway. Petra was resurrected along with many other mutants by The Five on Krakoa, and was last seen with Vulcan in the Summers House on the moon.
SWAY
Harnessing temporal powers, Sway is able to manipulate time on a small scale. Her powers allow her to replay events going back a few hours, stop time for minute bursts and slow down time in a similar confined time limit. Suzanne Chan was drafted in by Xavier during Deadly Genesis and lost her life alongside Petra. By using her manipulation of time, she was able to protect teammates Vulcan and Darwin by using her abilities in tandem with Petra's. Luckily for Sway, she was able to be brought back to life thanks to the actions of The Five on Krakoa. She was last seen in the Summers House alongside former teammates Vulcan and Petra.
DARWIN
Armando Munoz, also known as Darwin, has the incredible power of instantaneous adaption. This grants him theoretical immortality and he has even defied Hela's death touch. During the Deadly Genesis rescue mission, Darwin converted himself into energy to help preserve the essence of Petra and Sway when they perished. He then fused himself with Vulcan, giving Vulcan their combined powers. He was later separated from Vulcan by Rachel Summers and his powers allowed him reinstate his physical form. Since then, Darwin has been an occasional member of several X-Men team and moved to Krakoa when the island nation was established. He is currently on-mission with X-23 and Synch to defeat the Children of the Vault.
VULCAN
Gabriel Summers, known as Vulcan, is the brother of Cyclops and Havok. An Omega-Level mutant, Gabriel is able to absorb and manipulate energy and even siphon the powers of his enemies. He was the only one to physically come back from the Deadly Genesis rescue mission. He exposed Xavier's cover up and easily defeated the X-Men in battle. He fled into space where his power allowed him to take over the Shi'ar Empire. His despotic time as emperor was brought to a close when he was killed by Black Bolt. He returned to mutant kind after the establishment of Krakoa and lives in the Summers House with his family. It revealed in Jonathan Hickman and Leinil Francis Yu's X-Men #10, however, that Vulcan was not resurrected by The Five, but by mysterious aliens.