Oscar-winning film star Susan Sarandon has done a lot of voice work in the past, but not all of it the "cool" kind.

Actors often get headlines when they voice characters in animated movies, but that's just one type of voice work. The lion's share of Sarandon's work has been less celebrated work as a narrator, mostly for political documentaries (she's well known for her activism).

For example, she narrated the 2013 documentary "Trailblazers in Habits," about a group of nuns working against racism and poverty in the U.S. and elsewhere. She was also one of the celebrity narrators of the 2014 environmentalist documentary "Saving My Tomorrow" that aired on HBO.

But it hasn't all been big issues and reality checks. Sarandon has also had some fun with her voice, doing characters in such family-friendly films as "Cats & Dogs" (2001) and "Rugrats in Paris: The Movie" (2000).

She voiced Spider in 1996's "James and the Giant Peach," which also required a bit of singing. (We already knew she could sing, though -- she did quite a bit of it in the less family-friendly 1975 classic "The Rocky Horror Picture Show.")

Sarandon seems to enjoy the character work, since she has two more such roles coming down the pipe.

She recently signed on to voice a nanny robot in the animated comedy "Spark," about a monkey, a fox and a warthog who try to save their planet from a mad military ruler. Weird as that sounds, it also landed fellow A-listers Jessica Biel and Hilary Swank for roles.

Sarandon also did a voice for the stop-motion animated comedy "Hell & Back," which is due out later this year (though it's been stuck in the post-production stage since 2012, so don't hold your breath).

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