Chemistry is that "thing" between two characters that is so electric, it cannot be ignored.
It's hard to explain what happens in that moment, but it's best described as a spark that almost makes you forget that you're watching and rooting for a fictional couple.
We're constantly drawn to relationships between two characters because of their undeniable chemistry.
The best type of chemistry is the one that isn't forced -- it's natural and effortless and oftentimes, translates off-screen.
It can happen between friends that aren't aware of their feelings for each other, a couple that's about to embark on a romantic relationship, or lovers who, despite the obvious chemistry, can't seem to make it work.
Here's our list of characters with undeniable chemistry that could set off fireworks. There are so many to choose from that we couldn't add them all. Let us know who you'd add onto the list!
Rio and Beth - Good Girls
It doesn't matter if they're arguing, making shady deals, or hooking up, anytime these two share a scene, it's electric and intoxicating. I know it's dangerous, but I can't stop rooting for them.
Mic and Jared - Manifest
They were apart for five years and in that time, Jared married Mic's best friend, yet their spark never went out. When they're finally reunited, it's as if nothing has changed and even though they know it's wrong, they can't stay away from each other.
Sutton and Richard - The Bold Type
You can feel the passion between them anytime these two are in a room together. Though they tried to end things because of their age difference, they ultimately fell back into each other. You don't travel halfway across the world to profess your love to someone unless you know for certain they're 'the one.'
Elijah and Hayley - The Originals
It's a shame that Haley and Elijah never got a chance to pursue a romantic relationship because there was so much unspoken love between them until the very end.
Elizabeth and Henry McCord - Madam Secretary
When it comes to hottest married couples on television these two top the list. They have some serious chemistry both on and off the screen!
Wyatt and Lucy - Timeless
Wyatt and Lucy were the last to realize they had feelings for each other, but all the signs were there in every time period they traveled to.
Maggie and Alex - Supergirl
Maggie and Alex brought out the best in each other and although things didn't work out because they wanted different things out of life, the fandom still has hope that they'll one day reunite.
Jasper and Eleanor - The Royals
Jasper was Eleanor's drug. No matter how many times she fought to move on, she always found herself back in his protective arms. And there wasn't anything Jasper wouldn't do for his "princess."
Beth and Randall - This Is Us
Beth and Randall are so in-sync they've managed to weather all the ups-and-downs that come with making a long-term relationship work all while keeping the passion alive. Perfect couples don't exist, but these two come pretty close.
Liza and Charles - Younger
Stolen glances and kisses turned into a full blow relationship once Liza and Charles admitted their feelings for each other. Charles even made the ultimate sacrifice and gave up his company to be with her.
Hollywood and Violet - Queen Sugar
Hollywood and Violet are those "drunk on love" adults whose chemistry, including their sexual chemistry, is off the charts. When these two get busy, they light up the screen.
Alex and Michael - Roswell, New Mexico
Alex and Michael have this magnetic chemistry that's unmatched by any other couple on the series. They are drawn to each other even though their love is, in a way, forbidden. Their history may be complicated, but we're all hoping they figure out a way to make things work.
Will and Frankie - Whiskey Cavalier
Will and Frankie started off hating each other but their undercover marriage led to some real feelings. Their bickering, funny banter, and hot smokin' scenes exuded an undeniable connection and passion. Sadly, it wasn't enough to land them a second season.
Mina and AJ Austin - The Resident
Mina and AJ have never been together romantically, but they've forged an impressive partnership that's rooted in a deep understanding and respect for one another. Not to mention, their chemistry is off the charts. They've both expressed a romantic interest in each other so hopefully, it'll happen one day.
Liv & Fitz - Scandal
Liv and Fitz's love affair was one for the history books. They both risked everything to be together for a few fleeting moments, but even with so much chemistry, their relationship was too toxic. Fitz willingly took the country to war to save the woman he loved.
Jane and Rafael - Jane the Virgin
Jane and Rafael shared a mutual attraction from the moment they laid eyes on each other. No matter what life throws their way, they always find their way back to each other because they're meant to be.
Teresa and James - Queen of the South
Teresa and James' relationship was a fan favorite. It was forbidden and smoldering up until he turned himself over to the CIA to keep them away from her.
Bellamy and Clarke - The 100
It's hard to deny the chemistry between Bellamy and Clarke. Even when the characters are at odds, there's something there and they need and rely on each other. The actors, Bob Morley and Eliza Taylor, even got married in real life.
Rick Castle & Kate Beckett - Castle
The will-they-or-won't-they dance went on for a while, but the chemistry between the polar opposites was undeniable. Even when the writing took a downward turn, their flirtation kept fans coming back for more.