Cathy Weseluck is a Canadian actress and comedian of Russian descent. She has worked frequently as a voice actress for Ocean Productions, a Canadian media production and voice acting company based in Vancouver, British Columbia. Weseluck has provided voice acting for both original animated series and for English adaptations of animated works from several countries. In addition, Weseluck has worked as a voice director and instructor, a singing director, and a casting coordinator.

Early in her career, Weseluck worked as an associate producer at CBC Radio, the English-language radio operations of the Canadian Broadcasting Corporation. A co-worker encouraged her to attempt to work in voice acting. She initially voiced advertisements for the Vancouver Centre Mall, before starting to work in animation.

In "Mobile Suit Gundam" (1979-1980), Weseluck voiced the regular character Mirai Yashima. Mirai was a member of an upper-class family and the helmsman of the mobile suit carrier White Base. In the same series, Weseluck voiced the young orphan Katz Kobayashi, who joined the crew of the White Base.

In "Maison Ikkoku" (1986-1988), Weseluck voiced Koizumi, a female member of the Puppet Club. She and her teammates were puppeteers and friends of the male protagonist, Yusaku Godai. In the anime OVA "Project A-ko 2: Plot of the Daitokuji Financial Group" (1987), Weseluck voiced Shiko "C-ko" Kotobuki. The character was a humanoid alien from the Alpha Cygnan race. Her female friends Eiko "A-ko" Magami and Biko "B-ko" Daitokuji had an intense rivalry over who gets to spend time with C-Ko. Weseluck also voiced C-Ko in the sequels "Project A-ko 3: Cinderella Rhapsody" (1988) and "Project A-ko 4: FINAL" (1989).

In the English adaptation of "Ranma ½" (1989-1992), Weseluck primarily voiced Shampoo. Her character was a Chinese Amazon and one of the four fiancees of Ranma Saotome. She was betrothed to Ranma by the ritual laws of her village after he twice managed to defeat her in combat. Shampoo could shape-shift into a cat, which further complicated her relationship with Ranma. Ranma suffered from ailurophobia, a persistent fear of cats. Weseluck also voiced the recurring antagonist Azusa Shiratori, a martial artist and ice skater with kleptomaniac tendencies. Azusa was one of Ranma's opponents. In addition to these two major characters, Weseluck voiced the minor recurring character of Yuka. Yuka was a classmate of the regular character Akane Tendo and apparently one of Akane's closest friends.

In the Ocean Group dub of "Dragon Ball Z" (1989-1996), Weseluck voiced the child version of Trunks. The character was a human-alien hybrid, son of the reformed alien villain Prince Vegeta and the human scientist Bulma. She also voiced Maron, the beautiful but air-headed and fickle girlfriend of Krillin.

In a 1991 episode of "The New Adventures of He-Man", Weseluck voiced Teela. The character was a friend of He-Man from his original time period, though this series was instead set in the distant future. Teela was briefly sent into the future by the Sorceress of Grayskull, in order to cure He-Man's homesickness. Teela was one of the few Eternian characters to appear in this series, though Weseluck's version of the character had been redesigned to resemble She-Ra.

In the television series "Double Dragon" (1993-1994), Weseluck voiced the police officer Marian Martin, a major supporting character during the series' first season. The series was based on the then-popular video game series "Double Dragon" (1987-), where Marian was the main love interest for the twin brothers William "Billy" Lee and James "Jimmy" Lee.

In "Mobile Suit Gundam Wing" (1995-1996), Weseluck voiced the recurring character of Dorothy Catalonia. The character was introduced as a spy for the Romefeller Foundation, though she was eventually established to have her own agenda. Dorothy was trying to ensure an end to the current wars through arranging that the combatants were too traumatized to continue fighting. In the same series, Weseluck voiced the circus knife-thrower Catherine Bloom. Catherine was the estranged sister of the mobile suit pilot Trowa Barton.

In the short-lived series "Cybersix" (1999), Weseluck voiced the protagonist Cybersix. The character was a leather-clad gynoid (female android) who was trying to thwart the plans of the mad scientist who had created her. Cybersix maintained the regular job of a high school literature teacher, cross-dressing as a male to maintain a secret identity. The series was based on the Italian and Argentinian comic book series "Cybersix" (1991-1999) by Carlos Trillo and Carlos Meglia.

In "Inuyasha" (2000-2004), Weseluck voiced Mrs. Higurashi, the widowed mother of co-protagonist Kagome Higurashi. The character was aware that the daughter was regularly time-traveling to the feudal era, and her main concern was to provide her with food supplies. When the half-demon Inuyasha (Kagome's companion) time traveled into the future, Mrs. Hiugurashi provided him with a place to stay.

In the Generation 3 "My Little Pony" direct-to-video films, Weseluck voiced the young unicorn Rarity. Rarity was the main character in the animated film "My Little Pony Crystal Princess: The Runaway Rainbow" (2006), where she accidentally teleported herself to a distant location. Her efforts to return home were part of the film's main plot. Weseluck voiced the young detective Near in "Death Note" (2006-2007). Near headed an organization searching for the serial killer Kira/Light Yagami, following the murder of the leading detective L. He served as the main antagonist to the series' villain protagonist. By the end of the series, Near became the new L.

In the magical girl series "Powerpuff Girls Z" (2006-2007), Weseluck voiced the supporting character of Ken Kitazawa. He was the child genius son of Professor Utonium. Ken set the series' events in motion, by accidentally granting superhuman powers to three teenage girls: Hyper Blossom/Momoko Akatsutsumi, Rolling Bubbles/Miyako Gotokuji, and Powered Buttercup/Kaoru Matsubara. Ken helped the girl start their careers as superheroines, while treating them as his surrogate sisters. The series was based on the animated series "The Powerpuff Girls" (1998-2005), but reinterpreted the personalities of the three main characters and removed their status as siblings to each other.

In "Storm Hawks" (2007-2009), Weseluck voiced the recurring villain Ravess. The character was nominally loyal to Master Cyclonis, the female sovereign of the Cyclonian Empire. But Ravess privately considered Cyclonis to be incompetent and unworthy of the throne. Ravess typically ignored orders by her own superiors, preferring instead to execute her own plans. She was eventually exiled after a failed term as a regent for the absent Cyclonis.

In "Mobile Suit Gundam 00" (2007-2009), Weseluck voiced the colonel Kati Mannequin, a member of the military forces of the Advanced European Union. Kati represented a faction who had managed to unify the European continent. She served the role of the tactical coordinator and commander in the army. Her love interest was the mobile suit pilot Patrick Colasour, who she eventually married. Patrick was slavishly loyal to her, following Kati whenever she changed her allegiance.

In a 2009 episode of "Iron Man: Armored Adventures", Weseluck voiced an animated version of Abigail Brand. The character was depicted as a SHIELD agent, held hostage by the supervillain Living Laser. The comic book version of Abigail is a human-alien hybrid with pyrokinetic powers, but the animated version was a seemingly normal human.

In "My Little Pony: Friendship Is Magic" (2010-2019), Weseluck primarily voiced the supporting character Spike the Dragon. The character was a tiny purple dragon who served as the loyal assistant to the unicorn and magic user Twilight Sparkle. According to his origin episode, a filly Twilight had used magic to hatch his egg. He had stayed by her side ever since, and he had not socialized with other dragons until his pre-teen years. Subplots involving Spike included his cultural differences from other dragons, his efforts to control his dragon-like greed, his romantic attraction to the adult unicorn Rarity, the mutual efforts of Spike and Rarity to shield each other from danger, and his growing friendship with the female dragons Ember (the reigning Dragon Lord) and Smolder.

In the same series, Weseluck voiced two other recurring characters. She voiced Mayor Mare, the female mayor of Ponyville. The character mainly served as the local authority figure. The only major information on her background was that she dyed her mane gray, while her natural hair color was pink. She was embarrassed when her secret was published in a gossip column. The other recurring character voiced by Weseluck was the hard-working dressmaker Coco Pommel. The character was initially introduced as the soft-spoken assistant to the domineering fashion designer Suri Polomare. She soon befriended rival designer Rarity (who was friendlier to her than Suri), and at a later point was employed as a salesperson by Rarity.

In the animated film "Thor: Tales of Asgard" (2011), Weseluck voiced Valkyrie/Brunnhilde. The character was based on a popular comic book character, an Asgardian warrior woman who has served as a member of both the Defenders and the Avengers. The Marvel character was in turn based on Brunhild, a shield-maiden or Valkyrie prominently depicted in Germanic heroic legend. The original character played a central role in both the "Nibelungenlied" (written c. 1200) and the "Volsunga saga" (late 13th century).

In "Littlest Pet Shop" (2012-2016), Weseluck voiced the female rabbit Buttercream Sundae. Buttercream was energetic, sweet, and upbeat, but mischievous and impulsive. Her impulsive behavior tended to have negative consequences for those around her, but rarely for herself. One of her episodes depicted as suffering from a split personality, with the other persona being the bully Flash McCarrots.

Weseluck has entertained audiences for at least 35 years, and seems to have no plans to retire yet. She has gained a fan following due to her portrayal of memorable characters in several animated franchises, and for her versatility in portraying different character types.