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On December 12, 2559, Spartan Theodore Sorel was onboard UNSC Infinity when it was ambushed by Banished forces upon arrival at Installation 07. As the Infinity fell to the Banished assault, Sorel was leading marines, including Private Chamberlain and Private First Class Miyazaki in repelling Banished boarders. Upon hearing Captain Thomas Lasky to evacuate, Sorel led the marines to the hangar bay for evacuation.
Sorel and his marines made landfall on the surface of Installation 07, but their aircraft Oscar 128 was downed in Banished-occupied territory. Having lost uplink to UNSC command and been spotted by Banished troops, Sorel and the marines were forced to hold their position. On the next day, Sorel and his marines witnessed an explosion causing the ring to fracture. Two weeks later, on December 28, Sorel went on a recon sweep and observed the ring being repairing itself, and returned to Miyazaki, noting that as per Rubicon Protocol, they were to continue sabotaging Banished operation on the ring.
At some point before April 24, 2560, Sorel regrouped with fellow Spartan Vedrana Makovich. On April 24, after being told of increased Banished activity near the Reverie by Spartan Bonita Stone, Sorel and Makovich observed a Banished excavation site south of the UNSC Mortal Reverie's crash site. The two correctly deduced that Banished War Chief Escharum was searching for the Monitor of the installation, 117649 Despondent Pyre, and spent the next few weeks stalling the Banished's excavation efforts.
When the Banished's excavation was completed on May 15, Sorel and Makovich infiltrated the Conservatory. Inside, the two were ambushed by the Sangheili Jega 'Rdomnai, with Sorel being wounded by 'Rdomnai's surprise attack. Makovich urged Sorel to run ahead to locate the monitor, while she would fend off 'Rdomnai. Makovich died in the following duel against the Sangheili, while Sorel made a last stand deeper inside the facility, having killed multiple Banished troops before being killed by the Jiralhanae brothers Tovarus and Hyperius. Sorel's body remained inside the Conservatory and was found on May 28 by Master Chief Petty Officer John-117, who recovered his thruster pack module.
During the Battle for Installation 07, Spartan Sorel wore the MJOLNIR [GEN3] armor, employing the ISR-class helmet, UA/Agathius shoulder pads, and UA/Type SA knee pads. He carried a thruster module, which was inherited by John-117.
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