Operation Intercept was a Dalek plan during the Last Great Time War devised by the Dalek Time Strategist. In order to intercept an ancient Time Lord artefact, the Daleks restored Phaidon, a planet they had destroyed in the early days of the Time War.
Ollistra dispatched the General and Leela to prevent the Daleks' obtaining the relic, and they collaborated with a group of surviving Warpwrights on the planet led by Commander Daari. At the same time Narvin discovered the plan whilst sabotaging a Dalek ship and investigated on behalf of the resistance. (AUDIO: The First Days of Phaidon)