Summer Glau

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5. Summer Glau: Glau takes over where Arnold Schwarzenegger left off, as the good terminator in Fox’s "The Sarah Connor Chronicles." He said he’d back, but as a girl? Ha, ha, Arnold Schwarzenegger is a pansy. (Kidding, kidding.) Glau is known for her role as the intellectual, ass-kicking Christlike figure River-Tam in "Firefly" and its movie, "Serenity." In "Sarah," she’s the skinny little powerhouse who protects Sarah and her kid from evil terminators.

There is a stretch of the imagination, since Glau is small, but that’s the point. Terminators can now be deceivingly slight, apparently. And Glau brings her River-Tam-like concentration to the part.

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