Diabolical
We checked 8 streaming services in India on 04 Jun 2026 at 21:17 IST
About
Like trying to decipher the value of a book without ever opening it, judging a person by his or her outward appearance can be a mistake. Someone may look perfect on the outside, but even the most kind-hearted soul has a dark side looming. "Diabolical" is a docuseries that delves into the minds of murderers, asking a simple question: "Why did they do it?" The acts were committed with extreme premeditation -- many were months or even years in the making. Tension builds in each episode as law enforcement taps into the methods of devious masterminds, aided by insights from forensic psychologists and psychiatrists as well as criminal profilers.
Cast
Episodes
Season 1
Mistress Roulette
Married family man Dr. Adam Frasch has a booming practice, and he loves to spend money on houses, automobiles and exotic dancers; ultimately, the doctor will reap what he sows in deceit and jealousy.
Lying For Love
Temptress Cathy Cousin moves in next door to devoted family man Tim Koile, wrapping him around her finger and convincing him to satisfy her every whim no matter how diabolical.
'Til Death Do We Part
Lyle and Carol Kopenskey are high school sweethearts who marry after graduation; after 40 years of marriage, one of them becomes involved in an extra-marital affair that leads to cold-blooded murder.
Who Lies Beneath
Valuing wealth more than love, Michelle Donohue casts aside good men before meeting Mr. Right who gives her a taste of her own medicine and sends her down a murderous path.
Best Of Friends
After sneaking out to attend a party, 19-year-old Jose Najera returns home to find both of his parents dead in their bedroom. It is unclear if it is a random killing or a botched robbery.
Mother Of All Murders
Janet Lynn Mickey dreams of starting her own family and marries college football star Darrell Tyburski; plans change after the young couple begins having children, leading them down a very dark path.
Family Or Foe
A young family is on an evening stroll when suddenly terror strikes. Nothing seems to add up during the investigation, it is not clear if it is random violence or a mastermind at work and the truth will take years to emerge.
Accident Waiting To Happen
Single mom Rainey Morin thinks she has found her one and only soulmate in Robert Kowalski. However, beneath his bright veneer is a dark history threatening to wreak havoc upon her life and those around her.
Where does Diabolical rank today?
Diabolical is #9696 on the CineFlixo Daily Streaming Charts today.
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Watch Diabolical Online Free — All Episodes in HD
If you've been searching for Diabolical all episodes in HD, CineFlixo has you covered. This highly acclaimed Inglés crime and documentary title from 2018 is available to stream instantly — no ads to fight through, no paid subscriptions, no annoying redirects.
About Diabolical
Like trying to decipher the value of a book without ever opening it, judging a person by his or her outward appearance can be a mistake. Someone may look perfect on the outside, but even the most kind-hearted soul has a dark side looming. "Diabolical" is a docuseries that delves into the minds of murderers, asking a simple question: "Why did they do it?" The acts were committed with extreme premeditation -- many were months or even years in the making. Tension builds in each episode as law enforcement taps into the methods of devious masterminds, aided by insights from forensic psychologists and psychiatrists as well as criminal profilers. Across 3 seasons and 30 episodes, originally airing on Investigation Discovery, with status "Returning Series".
Diabolical Cast and Characters
The cast features Ross Huguet (as Narrator (voice)). Their performances are a major reason Diabolical has built such a passionate audience.
Where to Watch Diabolical Online
Want to watch Diabolical online without paying? CineFlixo is the easiest way. Click play and the series starts in seconds. No popups, no "5 day trial that auto-charges" — just the show.
▶ Watch Diabolical NowWhy People Are Watching Diabolical
There's a reason Diabolical keeps showing up on "must-watch" lists. What makes it work is tight pacing that earns its twists. If you enjoy Inglés storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.
Frequently Asked Questions about Diabolical
Where can I watch Diabolical online for free?
You can watch Diabolical online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.
How many episodes does Diabolical have?
Diabolical has 30 episodes across 3 seasons. All episodes are available to stream right here on CineFlixo.
Is Diabolical good? What's the rating?
Diabolical holds a 8.0/10 rating based on 2 reviews — genuinely excellent.
Who is in the cast of Diabolical?
The main cast includes Ross Huguet.
Is Diabolical available in Inglés?
Yes — Diabolical was originally produced in Inglés and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.
When was Diabolical released?
Diabolical first aired in 2018.
Do I need an account to watch Diabolical on CineFlixo?
No. CineFlixo is free and you can watch Diabolical without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.
Similar Series You Might Like
If you enjoyed Diabolical, check out Columbo, Born Evil: The Serial Killer and the Savior, Merseyside Detectives: The Murders of Ashley and Olivia, 3 Will Be Free, and Pandora's Box: Unleashing Evil.
Frequently Asked Questions
Where can I watch Diabolical for free?
You can watch Diabolical online for free on CineFlixo. All 30 episodes across 3 seasons are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.
How many seasons and episodes does Diabolical have?
Diabolical currently has 3 seasons and a total of 30 episodes. The series status is "Returning Series", so the episode count may grow as new seasons are released. You can browse the full episode list on CineFlixo and continue watching from where you left off.
What is Diabolical about?
Like trying to decipher the value of a book without ever opening it, judging a person by his or her outward appearance can be a mistake. Someone may look perfect on the outside, but even the most kind-hearted soul has a dark side looming. "Diabolical" is a docuseries that delves into the minds of murderers, asking a… It belongs to the Crime, Documentary genres.
In which language is Diabolical originally available?
Diabolical was originally produced in English. On CineFlixo the show is available in its original English audio, which is the most authentic way to experience the dialogue, music, and performances. Check the player options on the watch page for available subtitle tracks.
When was Diabolical first released?
Diabolical first premiered on January 1, 2018 (2018). The show is still ongoing with new episodes being released.
All Seasons
Browse every season of Diabolical — 3 seasons in total
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