Using the TARDIS telepathic circuits, the Doctor mentally summons the Third Doctor to assist with the technical aspects of the plan. The Doctor takes one of Ishtar's mental implants, and wires it into the TARDIS telepathic circuits, in effect downloading Ishtar into the TARDIS, keeping her alive long enough to disarm the bomb. Unfortunately, when the Doctor tries to delete Ishtar's mind from the TARDIS circuitry, he discovers that she is no longer there.