After watching the original "Guardians of the Galaxy" in 2014, I wouldn't have predicted that Karen Gillan's Nebula would become my favorite character by the trilogy's end . Yet, here we are.

Nebula has the most dramatic and transformative arc in the "Guardians" trilogy. In the first movie, she's a mere henchwoman for Ronan the Accuser (Lee Pace). But there are hints of pain beneath her half-metal skin, particularly when she shares the screen with her adopted sister Gamora (Zoe Saldaña). Both were raised to be assassins by the "Mad Titan" Thanos (Josh Brolin) and pitted against each other.

Only by breaking away from Thanos do the two truly grow into sisters, which is what their arc in "Guardians of the Galaxy Vol. 2" is all about. By "Vol. 3," Nebula has evolved into an outright hero

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