Dr. Abby Sinian is an archaeologist and curator of the Megakat City Museum of History. Smart, beautiful and brave as well as tops in her field, Dr. Sinian doesn't hesitate to get down and dirty when working an archeological site or panic when in danger (encounters with a prehistoric cat, Pastmaster, mummies, etc.). Unlike most scientists in her field, Dr. Sinian does not limit herself to the factual and tangible; she is an expert on the supernatural and the occult and often proves useful in situations involving villains like the Pastmaster. As Curator of the Megakat Museum of History, Dr. Sinian often proves to be an excellent informational resource for when creatures and villains from the past manage to make a comeback in the modern realm.
- Her name is a pun on the cat breed Abyssinian.
- Voiced by the late Linda Gary in the original English version and by Katsue Miwa in the Japanese dub.
- Dr. Sinian would've appeared a fourth time in the episode "Succubus!" (also known as "The Curse of Kataluna"), had the show not been cancelled. Here, she would've told Callie Briggs and Felina Feral about the legend of the evil succubus, before being attacked along with them by Katrina Moorkroft's pet three-headed monster.