Smallville: 10 Best Characters Only In One Episode

5. Sarah Conroy

Sarah Conroy Katharine Isabelle
The CW

Katharine Isabelle has gone on to forge a career as a favourite of the horror genre, with American Mary, Ginger Snaps, See No Evil 2, and Freddy vs. Jason just some of highlight's of the Canadian's résumé. And it was the Nightmare on Elm Street franchise's Freddy Krueger who seemed to provide the inspiration for Isabelle's one-and-done Smallville character.

That character was a telepath named Sarah Conroy.

Turning up in the third season 'Slumber' episode, Sarah had been left in a six-year coma following a car accident that killed her parents. As their car went off a bridge into a river, Sarah just so happened to come into contact with some meteor rock - which ended up giving her the ability to enter Clark Kent's dreams.

Clark saw these visits as a cry for help from Sarah, and his investigative work saw it revealed that Sarah was being kept in a coma by her no-good uncle. By the time the two met in real-life, Sarah was aware of Clark's unique abilities - only for CK to play down this suggestion as merely the sort of crazy things that we see in our dreams.

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Once described as the Swiss Army Knife of WhatCulture, Andrew can usually be found writing, editing, or presenting on a wide range of topics. As a lifelong wrestling fan, horror obsessive, and comic book nerd, he's been covering those topics professionally as far back as 2010. In addition to his current WhatCulture role of Senior Content Producer and Presenter, Andrew previously spent nearly a decade as Online Editor and Lead Writer for the world's longest-running genre publication, Starburst Magazine, and his work has also been featured on BBC, TechRadar, Tom's Guide, WhatToWatch, Sportkskeeda, and various other outlets, in addition to being a Rotten Tomatoes-approved film critic. Between his main day job, his role as lead panel host of Wales Comic Con, and his gig as a pre-match host for Wrexham AFC games, Andrew has also carried out a hugely varied amount of interviews, from the likes of Robert Englund and Eli Roth to Kevin Smith and the Russo Brothers, to Kevin Conroy and Frank Miller, to Bret Hart and Sting, to Mickey Thomas, Joey Jones, Phil Parkinson, and Brian Flynn, to many, many more. Where his beloved Wrexham AFC is concerned, Andrew is a long-standing season ticket holder and an FSA Award-winner for his time co-hosting the Fearless in Devotion podcast.