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Narratively, the episode had several introductions. It introduced the Slitheen, who would return to Doctor Who and The Sarah Jane Adventures. It also marked the first appearance of Toshiko Sato, who would later feature as a regular character on Torchwood, and as she later revealed herself to be an acting member of Torchwood Three at the time of her first appearance, this was technically the earliest instance of the presence of the Torchwood Institute seen in Doctor Who, though the organization would not be explicitly named and introduced until TV: Bad Wolf. In addition, this episode introduced another recurring character, British politician Harriet Jones. It also introduced UNIT to the revived series.