Lots of good suggestions already posted here. I'm bored by Kristen Stewart as the inevitable victim du jour, but agree that Taylor Swift might make a good victim for Katy Perry. Pop singer turned pop actress Hannah Spearritt is another possibility.
Any more, poor Keira Knightley is so skinny that she could be the victim of anyone here, but Katherine Heigl would really ride her. Kate Beckinsale is a good idea for a closer match. Going back To "Roswell," Kat could demolish little Shiri Appleby.
Completely endorse Cameron Diaz being fed to Angelina Jolie. If not, there's already too many Angie vs Jen would-be catfight reports, and there's no reason for AJ to take that match. Instead, she could hunt a more acclaimed actress, say, Julianne Moore.
Why not try another supposedly kick-ass type, say, Milla Jovovich, against the more convincing Charlize Theron? Piper Perabo is someone else who plays a spy on screen but probably can't back it up off. Evangeline Lilly is another that Charlie could expose.
Much as I enjoy Megan Fox's bad attitude, I suspect neither she nor Olivia Wilde could easily dominate many of the victims suggested so far. They both need to take on lightweights. The way their respective careers are going, I'm sure Megs would enjoy torturing Natalie Portman, but what with her being pregnant and all, the last-minute sub could be someone like Carly Pope or Selma Blair.
Pretty Leighton Meester is someone Olivia Wilde probably could dominate, but like Kristen she turns up on a lot of victim lists. Aside from the occasional guest role, Olivia's OC-mate Rachel Bilson seems to have time on her hands. Olivia might still have a grudge against her from being written out of the show. Speaking of that, Jennifer Morrison (and possibly Amber Tamblyn) should have a grudge against Olivia over "House," but again, that would be a challenge rather than a domination. Olivia might be able to overpower little Lisa Edelstein, although I suspect the tiny party girl knows a few tricks that might surprise her.
