If the main character in your movie is a straitlaced do-gooder, or really, blandly relatable in any way, you’re going to need some eccentric figures to bring some spice to the party. More than mere sidekicks, these characters either make the world they inhabit feel dangerous and chaotic or bring order to insanity by sheer force of personality. They’re characters that make your ears perk just as the movie starts to lose you.

Character actors are tasked with making movies more interesting, but only the best of them succeed. So here are 20 ultra-talented stars who never fail to make good films great, great films classic, and terrible films almost watchable.

1. PETER STORMARE

Jan Thijs, Starz Entertainment/FremantleMedia North America

Thank Fargo for this one. Peter Stormare’s magic stems from his range, which runs from Genuinely Kind to Terrifyingly Aggressive. You might expect him to play a growling bad guy every role, but his comic timing and humane sensitivity allow him to play everything from an unlicensed eye doctor in Minority Report to multiple voices on children’s shows to an incompetent nihilist kidnapper in The Big Lebowski.

2. OCTAVIA SPENCER

Twentieth Century Fox Film Corporation

Octavia Spencer is a world-class actor and producer with the hardware to prove it (including an Oscar, a BAFTA, and a Golden Globe). She’s a dynamite talent who offers a Herculean amount of support to everyone she shares scenes with. It’s possible that her trademark is a wry, knowing sense of humor, but she’s not that easily pinned down or pigeonholed, mightily subverting expectations in genre work like Snowpiercer and gut-wrenching dramas like Fruitvale Station.

3. SCOOT MCNAIRY

Eric Ogden, AMC

Possessing leading man looks and chops with a character actor’s transformative ability, Scoot McNairy is a deft craftsman who brings meek powder keg Gordon Clark to life on Halt and Catch Fire as well as embodying slimy slave trader Brown in 12 Years a Slave and amateurish holdup man Frankie in the crime drama Killing Them Softly.

4. TILDA SWINTON

Sandro Kopp, Sony Pictures Classics

Some character actors are in the hall of fame, some have won awards, but Tilda Swinton is on (and possibly from) another planet. She can more than hold her own as a leading performer, delivering searing portrayals in We Need to Talk About Kevin and deathly mystery in The Only Lovers Left Alive. But it’s her bizarre character work that most endures, like having your brain smacked with a rainbow baseball bat. From her toothy despot in Snowpiercer to her thousand-year-old dowager in The Grand Budapest Hotel to her wintry witch in The Chronicles of Narnia to a dozen other deeply strange performances, Swinton is playing a totally different game than everyone else. If Hollywood ever makes a David Bowie biopic, they know who to hire.

5. OLIVER PLATT

Chris Large, FX Networks

An actor’s actor, Oliver Platt never seems content to play the same role twice, yet he has the peerless ability to make it feel as if we’ve known a character our whole lives. That bone-deep familiarity is a quality that comes from another level of acting talent. Even if he’s only in one scene, Platt never phones it in. He’s never less than fantastic. Whether droll and off-the-cuff or stridently severe, you get the feeling that Platt is in it for the pure, unbridled love of acting.

6. ANN DOWD

Hulu

This Emmy-winning, 30-year veteran is in five movies coming out this year alone. That’s on top of a busy slate of guest starring roles on TV shows where she almost always becomes the best thing about the episode. She just finished up a remarkable run as the dead-eyed, chain-smoking Patti in The Leftovers, but her reign of matronly terror as Aunt Lydia on The Handmaid’s Tale has only just begun.

7. GIANCARLO ESPOSITO

Michele K. Short, AMC/Sony Pictures Television

To offer some perspective on Giancarlo Esposito’s genius: he recently did a single episode of Westworld where he delivered a fiery monologue that shook a character to the core, and the creators of Westworld almost definitely hired him because they knew he’d deliver a fiery monologue that would shake an entire audience to its core. Best known as Gus Fring on Breaking Bad (and Better Call Saul), Esposito has appeared in more than 75 movies and a list of TV episodes no one has time to count (though it's worth a reminder that he played Big Bird's camp counselor on Sesame Street). Unfailingly charismatic, Esposito is a modern marvel who, over four decades of acting, has never failed to astound.

8. CARRIE COON

HBO

Carrie Coon’s acting talent is so outstanding that she often commanded entire sequences in The Leftovers without interacting with anyone else. Her character was marked by isolation, and you could wind up not remembering to blink while watching her complete even the most mundane of tasks with a seemingly infinite pool of sorrow. She brought that concentration of anxiety to Gone Girl, where she played the sister of Ben Affleck’s character, and, most recently, to the third season of the Fargo TV series.

9. MICHAEL STULHBARG

Focus Features

Last year, in addition to his starring role in the third season of Fargo, Michael Stulhbarg was in three Best Picture nominees—The Shape of Water, Call Me By Your Name, and The Post—where he played pivotal roles as a modest Soviet spy, a father with a barn-burning monologue of compassionate acceptance, and a cosmopolitan newspaper editor, respectively. Three in one year. That’s incredible, but easy to believe when it comes to a talent like Stuhlbarg, who combines a workmanlike consistency and a stage actor’s perfectionism to create everymen who, far from being boring, are each singularly memorable.

10. MARGO MARTINDALE

FX Networks

The one. The only. Margo Martindale is so transcendent that BoJack Horseman features a character called “Beloved Character Actress Margo Martindale” (which is voiced by Martindale). Perhaps the most famous character actor currently working, she brings a maternal energy to even her craziest characters, which probably makes them seem even crazier. She also excels in roles that exude a sense of cool confidence, which helps if you’re handling soviet spies on The Americans or leading a weed-dealing family on Justified.

11. WALTON GOGGINS

FX Networks

Speaking of Justified: Walton Goggins earned an Emmy nomination for his portrayal of gritty-yet-charming criminal Boyd Crowder on the show, but he deserves so many more awards (though it's worth noting that he did win an Oscar in 2002, when The Accountant—a short film he produced and starred in—was named Best Live-Action Short Film). He’s got a flare for playing wild-eyed thugs and weirdos blissfully lacking self-awareness, but the scummy majesty he offers isn’t solely used for black hats. Goggins popping up randomly in movies and TV shows is always a delight because he’s a hell of an actor who seems to have time traveled here from the Wild West.

12. CCH POUNDER

CBS

CCH Pounder’s niche is serious professionals in police stations and emergency rooms, but she’s also brought steely playfulness to the neighborhood witch Madame Dorothea in the Mortal Instruments franchise. She’s consistently fantastic, drawing on years of expertise, natural magnetism, and an amazing number of starring and guest-starring roles on TV.

13. STEPHEN ROOT

Comedy Central

Stephen Root has portrayed so many outlandish characters that it’s shocking when he turns up in a movie in khakis and a Polo shirt. There are no limits on his range, and you can take your pick from a metric ton of favorites: Office Space, O Brother, Where Art Thou?, Dodgeball, Idiocracy, King of the Hill, NewsRadio, Brooklyn Nine-Nine, and Get Out are just a few. In his TV career, he’s been in over 700 episodes and continues to elevate his game. This is legendary character actor status here.

14. ALLISON JANNEY

Neon

West Wing fans have known about Allison Janney’s ability to command a room either with charm, severity, or by doing "The Jackal" since the late 1990s. But she solidified her place in the Character Actor Hall of Fame with her Oscar-winning turn as Tonya Harding’s abusive, bird enthusiast mother in I, Tonya. With a comic edge that echoes vaudeville (see: Hairspray) and a scary intensity when things get serious, Janney excels in any role you lay at her feet.

15. PAT HEALY

Magnolia Pictures

Often portraying the disturbing or the disturbed, Pat Healy is willing to push extremes of manic glee while staying grounded. He most notably shines through the grit in Cheap Thrills as the downtrodden mechanic Craig who performs increasingly violent and degrading stunts for a bigger pot of money. He also menaced Ann Dowd and Dreama Walker by phone in Compliance and was menaced by ghosts in The Innkeepers.

16. MICHELLE HURST

Netflix

If you’re a fan of Law & Order and its 1000 spinoffs, you’ve seen (and likely marveled at) Michelle Hurst a dozen times. She possesses a sharp ferocity, as proven by her portrayal of the acerbic Miss Claudette on the first season of Orange is the New Black. She was sidelined after a 2013 car accident, but she’s back this year in a supporting role in the romantic comedy Permission, so hopefully casting directors will take of this criminally underused powerhouse.

17. MICHAEL PEÑA

Peter Iovino, Warner Bros. Entertainment Inc.

If you only know Michael Peña as the fast-talking goof in Ant-Man, you’d be forgiven for not realizing the dangerous dramatic work he has done since Crash. He’s the rare talent who’s at the top of his game whether trying to make us laugh, cry, or wrestle with difficult truths. How else can you explain him stealing scenes in Marvel’s miniature superhero film a year after transforming wholesale into Cesar Chavez for a biopic of the civil rights activist?

18. KATHRYN HAHN

Showtime

Kathryn Hahn has been outshining her leading counterparts for years, but Bad Moms really gave her room to run. She absolutely has the skills to heighten the drama in movies like Revolutionary Road and This Is Where I Leave You, but the sweet spot of her talent is in finding humor by playing an exaggerated version of our funny best friend. Jill Soloway’s Afternoon Delight proved Hahn could shoulder a starring role, but it’s great that she has found her stride as the bar-hopping, sexually adventurous single mother ripping through stereotypes in a budding Bad Moms franchise and continues to command the screen in ensembles.

19. KEITH DAVID

Adam Taylor, Fox

This Juilliard graduate got his cinematic start with The Thing and Platoon, then went on to lend his unmistakable, Emmy-worthy voice and stature to a slew of harrowing dramas. But Keith David’s secret weapon is his comic perfection as an exasperated authority figure on display in There’s Something About Mary, Rick and Morty, the short-lived-but-brilliant Enlisted, and later seasons of Community. You can count on the Tony winner for acting perfection on screen or on stage.

20. BETH GRANT

Newmarket Films

If you need an actor to play a religious zealot or snappy rule-enforcer, Beth Grant is your first and last phone call. She’s the consummate stick in the mud, crafting figures who scold and harangue the main character for having even the tiniest bit of fun. We often love to hate the characters she portrays in movies like Donnie Darko and No Country for Old Men (not to mention her regular role on The Mindy Project), but she always transforms flat antagonists into fully realized humans by carving out space for sympathy.