Vicki's terror and vulnerability lead to her desperate actions to pilot the TARDIS, resulting in its unintended departure and the splitting up of the group.

Vicki wakes in the TARDIS women’s quarters to find the console still active—a clear sign of irregularity—and immediately calls for Barbara, who is nowhere in sight. Her voice escalates from …

The TARDIS lurches violently, throwing Vicki off-balance as the ship’s instability reaches a breaking point. Alone and terrified after Barbara’s sleepwalking departure and Ian’s abandonment, Vicki clings to the console …