Because you like Radar O'Reilly in M*A*S*H

Fiery and adventurous, Amy Pond is the sort of woman you'd want by your side on a journey through time and space. See them in Doctor Who.

Shawn Hunter may be a bit of a rebellious bad boy, but he has a heart that's pure gold. See them in Boy Meets World.

Small in stature, Clara Oswald has a big appetite for adventure. See them in Doctor Who.

Donna is boisterous and spunky traveller of the TARDIS, exploring worlds beyond the simple mundane enterprises of Earth. See them in Doctor Who.

Rupert Giles is a librarian on the outside, fearless evil-fighter on the inside. See them in Buffy the Vampire Slayer.

CIA operative Carrie Mathison is on a self-assigned mission to follow a lead, whether it be the truth or just her delusions playing tricks. See them in Homeland.

This power-hungry Time Lord calls himself the "master of all." Bonus: he has 13 lives. See them in Doctor Who.

Hoban Washburne shows you can be a hotshot space pilot *and* play with dinosaurs. See them in Firefly.

Waylon Smithers would do anything for his boss, and would love to do a few things *to* him. See them in The Simpsons.

Robin Scherbatsky is a former teen pop star who loves dogs and is scared of relationships. See them in How I Met Your Mother.

Rose Tyler may have not done too well in school, but she's certainly holding her own in space. See them in Doctor Who.