The original line was released in 1987, and was designed to compete with Jem (by Hasbro). Unfortunately, this line didn't sell as well as expected, and was discontinued less than a year after production.
It's theme: Lacy... Spacy... Out of this world!
The dolls have cleverly jointed bodies, if a little extreme, in addition to colorful (yellow, pink, green, purple and blue) hair and colorful facial screening. Their bodies are metallic hard plastic with soft vinyl heads.
Separate fashions were also available, along with several other accessories, including a body buffing station.
Because of the limited production numbers, the dolls are surprising difficult to find (especially in mint or NRFB condition). They can range from $40-55 for the more common dolls, and upwards of $315 for sets including the dog, Spark.
Finally, searching for Spectra dolls online has become more difficult in recent months, because of the addition of Spectra Vondergeist to Monster High's collection, also by Mattel.