Bettina Spier was a German singer, actress, and voice actress, best known as Stefanie 'Steffi' Sommer on ZDF’s The Adventures of Dr. Bayer. Other television credits include the FSB miniseries The Officer Factory, CBS’ Murphy Brown, and CBS’ Murder, She Wrote.

Video game voice-over credits include Alima Haddad in Syphon Filter: The Omega Strain/Logan's Shadow/Dark Shadow and Nina Diederich in The Outfit.

Film credits included German translations for the voice-overs of Jennifer Parker in Back to the Future and Back to the Future 2, Hannah in Silverado, Lisa Houseman in Dirty Dancing, Nancy in Terminator, Princess Lily in Legend, Cheryl in Jurassic Park 3, Elizabeth II in The Queen, and Eleanor Green in Man of the Year.