Pretty much ALL current Saturns are just rebranded Opels (Opel is known as Vauxhall in the United Kingdom.
Opel / Vauxhall Astra - Saturn Astra
Opel / Vauxhall Vectra - Saturn Aura
Opel / Vauxhall GT - Saturn Sky
Opel / Vauxhall Antares - Saturn Vue
Opel, Vauxhall and Saturn are part of GM. There is a rumour that Saturn would be getting new model to its line-up - Opel Corsa, which is about the size of Toyora Yaris.
Opel was a GM import for many years, the early 70's there was the GT (looked like a baby corvette), the Manta,and another compact, I think the Cadet (sp?)