Cathy

Cathy is a secondary but deeply unsettling figure in Dennis Kelly's DNA, a member of the teenage peer group whose collective panic following Adam's apparent death sets the play's moral machinery in motion. She does not occupy a central speaking role like Leah and Phil do, yet her presence carries enormous dramatic weight because of what she does rather than what she says. While other characters are defined by their words — Leah's relentless philosophising, Phil's loaded silences — Cathy is defined by her actions: intimidation, coercion, and ultimately violence. She enters the play as an ordinary adolescent and exits it as the closest thing the ensemble produces to a genuinely dangerous person. Kelly constructs her as a warning rather than a villain in the traditional sense; she is not born monstrous but shaped into something monstrous by circumstance and by the absence of anyone willing to hold her to account.

Cathy's trajectory is one of the starkest in the play because it moves in the opposite direction from what we might hope or expect. Most of the group experiences the cover-up as a source of anxiety — Brian breaks down, Leah becomes increasingly desperate, Richard begins to distance himself. Cathy, by contrast, thrives. The crisis does not weigh on her; it energises her. Her motivation appears to be status and excitement, a hunger for significance that ordinary teenage life has not satisfied. The cover-up provides her with a role, a purpose, and a kind of power. Her own line, "We've done something terrible and we need to do something terrible to cover it up," is chilling not because it is strategically wrong — it echoes Phil's cold logic — but because of the relish with which it is delivered. There is no anguish in it, no recognition of cost. By the play's end, rather than collapsing under guilt like Leah (who leaves the group entirely) or retreating into numbness, Cathy has consolidated a dominant position within the group's remnants, suggesting her arc is one of irreversible moral corruption.

• The intimidation of the innocent man: Cathy is instrumental in coercing and directing the accusation of the postal worker, enthusiastically participating in the framing of an innocent person. This is the moment her appetite for wrongdoing becomes active rather than passive.
• Silencing Brian: Her treatment of the psychologically fragile Brian — pressuring and manipulating him into continued compliance — demonstrates a calculated cruelty, exploiting vulnerability with no apparent discomfort.
• Adam's return and fate: When Adam resurfaces alive, Cathy is among those involved in his violent silencing. This moment transforms her from a bystander who enabled harm into a direct perpetrator. It is the point of no return in her characterisation.
• Her scenes with Jan: The reporting-pair scenes, where Cathy and Jan relay off-stage developments, function as a kind of Greek chorus — but Cathy's commentary consistently reveals desensitisation and even excitement, rather than the horror such events should provoke.

Cathy's relationship with Phil is foundational: she is his most willing instrument, carrying out his strategies with an enthusiasm that even he may not have anticipated. Phil provides the structure; Cathy provides the brutality. Yet she is not purely subordinate — her eagerness suggests she would find outlets for cruelty regardless. Her contrast with Leah is the play's sharpest moral juxtaposition. Leah's guilt-driven monologues and Cathy's cheerful complicity occupy the same peer group, making Kelly's point that empathy and its complete absence can coexist in the same social circle. With Adam, Cathy moves from indirect to direct harm — he is her most concrete victim, and his fate is inseparable from her agency. Her relationship with Brian exposes a predatory streak; she identifies weakness and uses it. Richard's gradual moral awakening, moving away from the group, serves as a structural contrast to Cathy's deepening investment, implying that choice — not circumstance — ultimately determines their divergent paths.