Built and LostYucatán, Mexico by the Incans. The temple was built on the convergence point of what would later be known as two Ley Lines in honor of Izel, who the Incans revered as a goddess, and its stone material was identical to that of the Di'Allas. Its purpose was to enable Izel to use the Di'Allas to open a portal to her world, known as the Fear Dimension, so that her kind could take over the Earth. A replica of the Temple of the Forgotten thus existed in the Fear Dimension, where The First, The Second and The Third would wait for the gateway to be open.
However, upon finally arriving on Earth, Izel herself ignored the exact location of the Temple of the Forgotten. She had to force Marcus Benson, who had identified three possible locations for the temple, to disclose it to her, threatening to make him relive the death of his husband if he did not comply. Once she got the coordinates and Benson was put out Izel's reach by Alphonso Mackenzie and Yo-Yo Rodriguez, Izel took the Zephyr One near the Temple of the Forgotten, while Benson gave its location to S.H.I.E.L.D. so they could go and stop Izel.
- "Once the Three open the Temple of the Forgotten, the flood will come. They will finally be free."
Izel brought Alphonso Mackenzie and Yo-Yo Rodriguez into the main hall of the temple and put them in handcuffs around a stone pillar. She then unleashed the energy of the Di'Allas stored in the Gravity Containment Device she had stolen from S.H.I.E.L.D., and the fears of Rodriguez and Mackenzie manifested in the form of Flint. Izel then possessed Flint and used his geokinesis powers and the energy of the Di'Allas to recreate the three Monoliths.
Izel briefly left the temple to send an army of Shrike, ordering them to bring back dozens of hosts to the temple so her kind could use them as vessels. She then returned into the temple as Flint had set free Rodriguez and Mackenzie, and she broke Flint's leg to prevent them from escaping. However, Deke Shaw, using a ShawDrive, transported himself inside the temple and equipped Rodriguez, Mackenzie and Flint with Sonic Barrier Cuffs. This enabled Rodriguez to fight Izel and to incapacitate her long enough for them to escape.
Shaw remained behind to distract the Shrike hosts who had begun to return while Rodriguez and Mackenzie took the injured Flint to safety. He attempted to teleport out of the temple, but since the ShawDrive needed time to recharge, he simply moved along the corridor of the temple. Fleeing from the hosts, Shaw then saw Izel performing her song, which caused the Di'Allas to resonate together, eventually creating the portal to the Fear Dimension. Growing afraid of the situation, Shaw managed to transport himself out of the temple, although in close vicinity to it, with the ShawDrive.
In the temple, Izel was soon confronted by Sarge and Melinda May, but although Sarge attacked her and pinned her on the ground, he was unable to strike her down with his sword. Eventually, Izel was able to win Sarge to her cause by having him remember his identity of Pachakutiq, and he stabbed May with the sword, sending her through the temple's portal. May arrived in the replica of the temple in the Fear Dimension, where she encountered the First, the Second, and the Third.
Remaining alone, Izel and Sarge had a brief argument about the former's actions, but they eventually set aside their disagreement as their attention was caught by something else: May, who had slain the First, the Second, and the Third, had thrown the fragments of the Di'Allas into the Temple of the Forgotten on the Earth side. Therefore, Izel decided to cross the gateway to open the portal for her kind herself.
While Izel battled against May in the Fear Dimension, S.H.I.E.L.D. returned to the temple in an attempt to stop her and Sarge. Leaving Shaw behind to take care of the Shrike hosts roaming the temple, Mackenzie, Rodriguez, and Daisy Johnson arrived in the temple's ceremonial hall to confront Sarge. However, Sarge easily managed to hold his own against them, despite Johnson's powers.
The battle eventually ended when Izel returned from the Fear Dimension and attempted to kill Johnson, only to be stabbed to death from behind by May, who had returned as well with Sarge's sword. While Sarge was being distracted by Johnson, May tossed the sword to Mackenzie, who used it to slay Sarge as well. In the aftermath of the battle, as May was dying from her wounds, Jemma Simmons arrived with a S.H.I.E.L.D. team, who sampled a fragment of the White Monolith and took May to save her, enabling S.H.I.E.L.D. to leave the temple.
Shortly after the S.H.I.E.L.D. agents left, the Temple of the Forgotten was destroyed by Ionizer Missiles sent by the Chronicom Hunters from a Confederate Destroyer Ship. The missiles were initially aimed at the Zephyr One, which disappeared thanks to its Phase Harmonic Teleportation Device, thus causing the missiles to end their course on the temple, obliterating it with the Di'Allas still inside.