Kat McAllister is a powerful and mysterious character introduced in episode 7 of the British crime drama series MobLand. Portrayed by acclaimed actress Janet McTeer, Kat is depicted as an influential American crime boss with global reach and deep connections in the criminal underworld

. Kat McAllister operates above the usual street-level conflicts seen between the main crime families in London, such as the Harrigans and the Stevensons. She commands respect and fear, able to make even Mexican cartel leaders comply with her orders. For example, she halts the execution of Seraphina Herrian by simply making a phone call to Jaime Lopez, a cartel figure, demonstrating her immense power and influence

. Her relationship with Harry Da Souza, a key character in the series, suggests a complicated and longstanding connection. Harry calls Kat in a moment of crisis, indicating he relies on her resources and authority. Kat’s presence hints at a larger, more international criminal network beyond the London-based families, and her true nature—whether purely criminal, political, or something else—is still shrouded in mystery

. Janet McTeer’s portrayal brings gravitas to Kat, emphasizing her cold elegance and strategic ruthlessness. Kat’s arrival marks a significant shift in the power dynamics within MobLand , introducing a new level of threat and complexity to the ongoing war between the established crime families

. In summary, Kat McAllister is a wealthy, influential, and enigmatic crime boss with international clout, whose involvement in MobLand raises the stakes for all the main characters involved in the criminal conflicts of the series