Karen Gillan

Karen Gillan went all in for her role as Nebula in Guardians of the Galaxy (2014)—I mean, she straight-up shaved her head. No half-measures; the hair came off, and that’s some serious dedication to a part. You don’t see that level of commitment every day, especially for a Marvel movie where, honestly, they could’ve just slapped a bald cap on her if they really wanted to. But nope, she went full chrome-dome. What’s wild is Marvel Studios didn’t just sweep up her hair and toss it—they actually took her shorn locks, made a wig out of them, and handed it back to her as a present. Kinda weird, kinda sweet, you know? And get this: she still has that wig. Like, imagine keeping a souvenir made from your own hair because you played a blue alien assassin. That’s one for the storybooks, right? Just goes to show the weird stuff actors do for blockbuster roles.

Amy Pond’s dynamic with the Doctor? Oh, it’s wild. She’s not the type to just nod along and do what she’s told, you know? If he says, “Stay put,” odds are she’ll wander off and stir up her own brand of trouble. That stubborn streak? Yeah, it gets under the Doctor’s skin sometimes—she’ll butt heads with him, question him, even flat-out ignore him if she thinks she’s right (which is, honestly, most of the time). But even when they’re at each other’s throats, there’s this deep friendship underneath it all. They fight, they bicker, but they’re thick as thieves. Honestly, their relationship goes from zero to a hundred real fast—one minute they’re laughing, next they’re arguing about saving the universe or whatever weird mess they’ve landed in. Messy? For sure. But that’s what makes it fun to watch. These two are both firecrackers, and when they clash, you really feel it.