Tanya Sloan was a civilian child with a research expedition in Africa when she was met by a young Aisha Campbell on the latter's mission to recover her fragment of the Zeo Crystal. However, when Aisha learns of an unnamed plague on the wildlife in the area, she decides to send Tanya back to the present in her stead with the fragment. Following the events of Mighty Morphin Alien Rangers, Tanya becomes Zeo Ranger II - Yellow of the Zeo Rangers. During the events of Power Rangers Turbo, Tanya becomes the first Yellow Turbo Ranger of the Turbo Rangers; she eventually gave her powers to Ashley Hammond and retired as a Ranger. Retroactively, she is also referred to as Zeo Yellow Ranger or Yellow Zeo Ranger, though these are in reference to the show, as opposed to proper labels. She has also been labeled Turbo Yellow Ranger, a variation on her in-show label.