She's just all-around awesome. I quote from Wikipedia:
As a companion, she is confident, inquisitive and possesses a sharp mind as well as a sharp tongue. She is also something of a feminist — in her first appearance she is infuriated when the Doctor asked her to make coffee, and she often verbally spars with fellow companion Harry Sullivan... Sarah never gives the impression that she is less than capable. In spite of the dangerous and frightening situations she often finds herself in, she loves adventure and risk, and in spite of her outward complaints, is always thrilled to go off in search of more adventure.
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She's just all-around awesome. I quote from Wikipedia:
As a companion, she is confident, inquisitive and possesses a sharp mind as well as a sharp tongue. She is also something of a feminist — in her first appearance she is infuriated when the Doctor asked her to make coffee, and she often verbally spars with fellow companion Harry Sullivan... Sarah never gives the impression that she is less than capable. In spite of the dangerous and frightening situations she often finds herself in, she loves adventure and risk, and in spite of her outward complaints, is always thrilled to go off in search of more adventure.