The escalating antagonism between the Doctor and the Rani as they engage in a battle of wits across multiple fronts, culminating in the Doctor's attempts to expose her true identity and stop her temporal experiments

As the Doctor examines the Rani's laboratory, she attempts to engage him in selecting specific materials for her machine, probing for his expertise while masking her true intentions. The Doctor, …

The Doctor and what appears to be Mel engage in a battle of wits within the Rani’s laboratory. Doubt lingers as the Doctor questions his companion’s behavior, probing for inconsistencies …