Ollus and his siblings were orphaned when his parents committed suicide to prevent their knowledge of the Cradle of the Gods from reaching the ears of the Daleks. The Eleventh Doctor discovered the three children hiding in the escape pod and they helped him discover how the intentions of the Dalek Foundation related to the Cradle and the Sunlight Worlds. However, the Doctor was exiled for accusing the Daleks of being evil (considered a hate crime), and Ollus and Sabel were placed under the care of Lillian Belle.
Approximately 90 years later, Ollus and Sabel were taken prisoner by the Dalek Time Controller and used as captives so the Doctor would activate the Cradle of the Gods. However, Jenibeth, turned into a Dalek puppet, resisted her control and fought the Daleks off while the Doctor set the Cradle to self-destruct. Before exploding, the Cradle turned the Blakelys back into children and brought their parents back to life as well. They no longer had any memory of the Doctor. (PROSE: The Dalek Generation)