text: Sebastian is a tuxedo cat, and Alexandra's sidekick. In the comics, Sebastian is the reincarnation of Sebastian Cabot, a witchcraft-practicing ancestor of the Cabot family. Alexandra finds that, by holding Sebastian in her arms, she can cast powerful magic spells (Alexandra and Sebastian's bond is represented in that they both have a matching white stripe in the middle of their hair/fur). This plot device was sporadically employed by various writers at Archie over the years; Alexandra was later shown to be able to cast spells on her own.  In the cartoon, Alexandra and Sebastian do not have magic powers but they still have their white stripes. Sebastian usually follows Alexandra's schemes when it comes to getting in between Josie and Alan, but unlike Alexandra, he has no real grudge or dislike towards Josie and is usually shown to be friendly to her.
  Alexandra's voice in the cartoons is provided by former Mouseketeer Sherry Alberoni, while Don Messick supplies the meows, screams, and Muttley-esque snickers for Sebastian. Alexandra was played by Missi Pyle in the live-action Josie and the Pussycats movie, while Sebastian does not appear in the live-action film.
  Alexandra appears as a supporting regular character who dislikes Josie McCoy on The CW's live-action series Katy Keene, portrayed by Camille Hyde. This version of Alexandra is the senior vice president of Cabot Entertainment. Similar to in the comics, she dislikes Josie. In Katy Keene, Alexander and Alexandra are step-siblings (posing as twins in public), a relationship complicated by their having dated in high school before Alexander's father and Alexandra's mother later married. Hyde also reprised her role in the musical episode "Chapter Ninety-One: The Return of the Pussycats" from the fifth season of Riverdale. Sebastian is mentioned in two episodes of Katy Keene.