Cast Of I Know What You Did Last Summer (tv Series)

Okay, so you know that super creepy movie, I Know What You Did Last Summer? The one that gave us all nightmares and a healthy dose of hook-hand paranoia? Well, guess what? They went and made it into a TV show! And before you start groaning about reboots and sequels, hear me out. This isn't just some dusty old relic trotted out for a quick buck. This I Know What You Did Last Summer series is a whole new beast, and it’s actually pretty darn good. Think less "teen slasher retread" and more "dark, twisty thriller with a seriously stylish vibe."
So, who’s behind all this suspense and questionable decision-making? Let’s dive into the cast that’s keeping us on the edge of our seats, shall we? Because honestly, the faces staring back at us are just as important as the mysterious killer lurking in the shadows. And trust me, there are a lot of shadows. So many shadows, you might need a flashlight just to read this article. (Just kidding… mostly.)
The Core Crew: Trying to Outrun Their Secrets
At the heart of this whole mess are our five main players. They’re the ones who, you know, did something last summer. And let's just say their summer plans didn't exactly involve tanning and ice cream. These are the folks trying to pretend everything is normal, while a killer with a seriously twisted sense of revenge is breathing down their necks. Talk about awkward family reunions, right? Except instead of your weird Uncle Steve, it’s a psycho with a penchant for sharp objects.
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Madison Iseman as Lennon Grant
First up, we have the enigmatic Lennon Grant, played by the super talented Madison Iseman. Lennon is the queen bee, the one with the perfect life… or at least, the one who projects the perfect life. She’s got the ambition, the looks, and a whole lot of secrets she’s desperately trying to keep buried. Madison does a fantastic job of showing us the cracks in Lennon’s polished facade. You can see the desperation in her eyes, the way she’s constantly fighting to maintain control. It’s like watching a really intense game of Jenga, where one wrong move could send everything crashing down. And let’s be real, with Lennon, there are a lot of wrong moves.
Madison herself is no stranger to the screen. You might have seen her in some other spooky projects, which is a good sign, right? Means she's got experience dealing with terrifying situations. Probably sleeps with a nightlight. (Again, mostly kidding.) Her performance is key to the show’s success, making Lennon both a character you root for and one you’re simultaneously wary of. It’s that delicious push-and-pull that keeps you hooked.
Brianne Tju as Margot North
Then there’s Margot North, brought to life by the equally impressive Brianne Tju. Margot is Lennon’s best friend, and that’s a friendship that’s about to be tested, shall we say, severely. Margot is the loyal one, the one who’s always there, even when things get messy. But as the secrets pile up, even the strongest friendships can start to fray. Brianne plays Margot with such a grounded, relatable quality. You feel her confusion, her fear, and her growing suspicion. She’s the audience surrogate in many ways, trying to make sense of the madness.
What I love about Brianne’s portrayal is how she captures Margot’s vulnerability. She’s not just a damsel in distress; she's a smart, capable young woman trying to navigate an impossible situation. And let's be honest, who wouldn’t want a friend like Margot when your life is literally on the line? Probably someone who doesn’t have a hook-wielding maniac chasing them, but still. She’s got your back.

Ezekiel Goodman as Dylan LaDuke
Moving on to Dylan LaDuke, played by the charismatic Ezekiel Goodman. Dylan is the quiet observer, the one who seems to know more than he’s letting on. He’s got a thoughtful demeanor, and his involvement in the group’s secret is a slow burn. Ezekiel brings a subtle intensity to Dylan. You can see the wheels turning in his head, the unspoken thoughts and feelings that bubble beneath the surface. It’s the kind of performance that makes you lean in and try to decipher what he’s thinking.
He’s got this really interesting presence on screen. He’s not always the loudest, but he definitely commands your attention. And that’s a tough balance to strike. Plus, he’s got that whole "brooding artist" vibe going on, which, let’s face it, is always a good look for a mysterious character. He’s the kind of guy you think you can trust, but then you remember… well, you know what they did last summer.
Ashley Moore as Riley Miller
Next up is Riley Miller, portrayed by the captivating Ashley Moore. Riley is the artist of the group, the free spirit who’s suddenly finding herself trapped in a nightmare. She’s struggling with her identity and her place in the world, and this whole killer situation is definitely not helping. Ashley injects Riley with a raw, emotional energy. You feel her pain, her confusion, and her fierce determination to survive. She’s got this resilience that’s really inspiring to watch.
Ashley is fantastic at conveying Riley’s inner turmoil. You see her grappling with her choices and the consequences. She’s not afraid to show the messier, more vulnerable side of things. And in a show that’s all about secrets, Riley’s journey is particularly compelling. She’s trying to find herself while also trying not to get… you know… chopped up. No pressure!

Sebastián Amoruso as Johnny LaDuke
Finally, rounding out our core group is Johnny LaDuke, brought to life by the energetic Sebastián Amoruso. Johnny is Dylan's twin brother, and he's definitely the more impulsive of the two. He’s got a rebellious streak and a history of making bad decisions. Sebastián plays Johnny with a captivating swagger and an underlying layer of insecurity. He’s the guy who’s always trying to play it cool, but you can tell there’s a lot more going on beneath the surface.
Sebastián’s performance is a lot of fun to watch. He brings this infectious energy to the character, even when Johnny is dealing with some seriously heavy stuff. He’s the one who’s most likely to do something reckless, which, in a show like this, is both terrifying and strangely entertaining. You’re constantly wondering what he’s going to do next, and whether it’s going to get him killed. (Spoiler alert: probably!) He’s got that youthful bravado, but there’s a real fear lurking there too, which makes him so compelling.
The Adults in the Room (Who Probably Wish They Weren’t)
Of course, it’s not just the kids running around in a panic. There are some adults involved too, and let’s just say their past actions are coming back to haunt them in a major way. These are the people who thought they could bury their secrets and move on, but as we all know, the past has a way of catching up. Especially when there’s a hook involved.
Spencer Sutherland as Dale "DJ" Miller
We have Dale "DJ" Miller, played by the multi-talented Spencer Sutherland. DJ is Riley's older brother and a guy who’s trying to protect his younger sister. He's got a good heart, but he's also got his own demons and a complicated relationship with the events of last summer. Spencer brings a quiet strength to DJ. He’s the steady presence, the one who’s trying to hold things together, even when he’s falling apart himself. You can see the weight of the world on his shoulders.
Spencer, who is also a musician, brings a different kind of energy to the role. He’s not just an actor; he’s an artist, and you can feel that depth in his performance. DJ’s journey is one of responsibility and regret, and Spencer navigates that beautifully. He’s the voice of reason, or at least, he tries to be. Which, in this town, is a rare commodity.

Fiona Rene as Riley and DJ’s Mom, Erin Grant
And then there’s Erin Grant, played by the formidable Fiona Rene. Erin is Lennon's mother, and she’s a powerful figure in the community. She’s got a lot to lose if the truth comes out, and she’s willing to do whatever it takes to keep her secrets safe. Fiona Rene is absolutely electric as Erin. She’s got this commanding presence, and you can feel the steely resolve beneath her polished exterior. She’s the kind of character who can deliver a threat with just a look.
Erin is the architect of much of the secrecy, the one pulling strings from behind the scenes. Fiona makes her utterly compelling, even when she’s doing questionable things. You understand her motivations, even if you don’t agree with them. She’s the ultimate "mama bear," but with a very dark twist. She’s protecting her cubs, but her methods are… well, let’s just say they wouldn't pass a background check.
The Mystery Deepens: Who’s Pulling the Strings?
Beyond the core group, there are other characters who are crucial to unraveling the mystery. These are the people who are either caught in the crossfire, or perhaps, are the crossfire. It’s all a delicious tangled web, isn’t it?
Brooke . . . as Clara, a friend of Lennon and Margot
We have Clara, played by Brooke . . . (yes, that’s her full name!). Clara is a friend of Lennon and Margot, and she’s not exactly thrilled about the secrets her friends are keeping. She’s observant and a little suspicious, and she’s determined to get to the bottom of things. Brooke brings a grounded, relatable energy to Clara. She’s the one who’s starting to question everything, and her skepticism is infectious.

Clara’s character is important because she represents the outside perspective, the person who isn't directly involved in the original "incident" but is getting dragged into the chaos. She’s the audience’s eyes and ears in a way, noticing the odd behavior and the hushed conversations. She’s the one asking the questions we’re all thinking.
Burn Gorman as Anton, A local business owner
And then there’s the always intriguing Burn Gorman, who plays Anton. Anton is a local businessman with a mysterious past and a potential connection to the events of last summer. Burn Gorman is a master of playing complex, often unsettling characters, and Anton is no exception. He brings a chilling presence to the role, making you wonder about his true motives.
Anton is the kind of character that keeps you guessing. Is he a victim? A villain? Or something else entirely? Burn Gorman’s performance is so nuanced, he makes you believe that there’s always more to the story. He’s the shadowy figure in the background, the one who could be pulling the strings or just observing the unfolding disaster. Either way, he’s captivating.
The Verdict?
So, what's the takeaway from this star-studded (well, up-and-coming star-studded!) cast? They've managed to breathe new life into a classic horror premise. The actors are all fantastic, bringing depth and complexity to characters who could have easily fallen into slasher clichés. They’ve got the vulnerability, the ambition, the desperation, and the sheer terror down pat. You’ll find yourself genuinely invested in their fates, even when you’re yelling at the screen, "Don't go in there!"
This show is a masterclass in building suspense, and the cast is the engine driving it. Each performance is carefully crafted, making you question who to trust and what the truth really is. It’s a thrilling ride, and honestly, it’s a lot of fun to watch these talented actors navigate such a deliciously dark and twisty story. They’ve taken a story we thought we knew and made it fresh, exciting, and utterly captivating. So, if you’re looking for something to sink your teeth into, something that will keep you guessing and maybe even make you sleep with the lights on (just a little!), then this is definitely the show for you. You won't regret diving into this chilling, yet ultimately rewarding, narrative. It’s a testament to great storytelling and the power of a truly brilliant cast to make us feel every single jump scare and every whispered secret. You’ll be hooked!
