Stay on target ‘Doctor Who’ Underrated Villain of the Week: Mire’Doctor Who’ Underrated Villain of the Week: Zygon You know Daleks and Davros and Missy the Master, Angels, and Silence hell-bent on disaster. But do you recall the most underrated Doctor Who villains of all?Each week, I will dig into the depths of the Whoniverse to examine one rejected, misjudged, or altogether forgotten big bad. In celebration of this week’s International Cat Day (Aug. 8), here’s one feline fatale you won’t want to cuddle up with.Never trust a nun. Never trust a nurse. And never trust a cat. (via BBC)SISTERS OF PLENITUDEFirst appearance: “New Earth” (2006)—season 2, episode 1Home planet: New SavannahDoctor: TenthCompanion: Rose TylerNever trust a nun. Never trust a nurse. And never trust a cat.The Sisters of Plenitude were an order of Catkind nuns, devoted to helping the sick.Dressed in wimples and habits, the nursing staff of the New Earth hospital conjures feelings of calm reassurance (unlike my own grimacing grimalkin). But exactly how do the duty-bound felines manage to bring people back from the brink of death, to cure incurable diseases?The Doctor isn’t the only one dying to find out.The last “pure” human, Lady Cassandra O’Brien.Δ17—as bitchy and trampoline-like as ever— lurks in the hospital basement, remotely spying on the Sisters. It’s not until she tricks a still-naive Rose into carrying her energy on two feet, though, that she can further investigate.Feisty felines (via BBC)Reunited with the Doctor, Cass-Rose squirms her way through the Time Lord’s musings, impresses with a newfound grasp on technology, and exposes herself by virtue of utter disgust at what they find.The hospital’s “intensive care unit” is lined with thousands of pods (a bit reminiscent of the Tomb of the Cybermen) containing artificially grown humans—and very sick ones, at that.“They were born sick. They’re meant to be sick. They exist to be sick. Lab rats,” according to the Doctor. “No wonder the Sisters have got a cure for everything. They’ve built the ultimate research laboratory. A human farm.”It’s a bit more … complicated for the nuns, who believe their work is righteous and paramount.Novice Hame (Anna Hope) (via BBC)“Mankind needed us. They came to this planet with so many illnesses. We couldn’t cope,” Novice Hame admits. “We did try. We tried everything. We tried using clone-meat and bio-cattle, but the results were too slow. So the Sisterhood grew its own flesh. That’s all they are. Flesh.”(Not to be confused with The Flesh, elastic doppelgängers liberated from their human “originals” in season six.)The well-intentioned procedure—think of all the lives saved!—backfires when Cass-Rose and assistant Chip free the infected. One touch is all it takes to pass on their disease. And one touch is all these people want, after a lifetime in solitary confinement.The Doctor and Cass-Rose (against her better judgment) create a disinfectant shower that instantly cures the humans, ending the attack and liberating hundreds of people into New Earth.Novice Hame (Anna Hope) with the Doctor (David Tennant) and the Face of Boe (voice of Struan Rodger) (via BBC)With blood on their hands paws, the surviving Sisters are arrested by the New New York Police Department. Novice Hame, however, is ordered to attend the Face of Boe—one of the oldest creatures in the known universe—as penance for her part in the Sisterhood’s crimes.Over time, the reformed cat grows fond of her patient, who saves her from an airborne virus that kills the New Earth Senate and most of the planet’s population. In return, Hame cares for and protects the Face of Boe until his dying day.Fun fact: Adjoa Andoh, who plays Sister Jatt, returned for Doctor Who seasons three and four as Martha’s mother, Francine Jones. But you’d never have known she was the same person under all that fur.Stream all of Doctor Who now for free with your Amazon Prime membership.Let us know what you like about Geek by taking our survey.