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Elizabeth Henstridge and Iain De Caestecker, 'Marvel's Agents of SHIELD'
You know them as: FitzSimmons, aka Leo Fitz and Jemma Simmons / Why we like them: While most of these underrated stars are recognized individually, it's hard to talk about the actors behind the adorable "Marvel's Agents of SHIELD" duo FitzSimmons as anything but together. Forget Ward, May, Skye and even Coulson; it's Fitz and Simmons who keep us coming back to "Agents of SHIELD" week after week. They bring both humor and gravitas to the series, and it's almost guaranteed that they're the characters people will be obsessing over in seasons to come. / Where else you've seen them: For De Caestecker, Young Percy on "The Secret of Crickley Hall," James Herriot on "Young James Herriot" and Paul on "The Fades." For Henstridge, Emily Alexander on "Hollyoaks."