TV show availability guide
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.
2018 8.0/10 community score 3 seasons · 30 episodes Returning Series
- Crime
- Documentary
Viewing market
Country-level availability
Where to watch in United States
16 platforms currently listed across all viewing options
Data checked 18 Oct 2026, 09:12 UTC
Included with subscription
7Streaming providerHBO Max Amazon ChannelNo linked platform guide yetDetails unavailable Streaming providerPhiloNo linked platform guide yetDetails unavailable Streaming providerDiscovery+ Amazon ChannelNo linked platform guide yetDetails unavailable Linked platform guideYouTube TVPlatform guideView details Streaming providerInvestigation DiscoveryNo linked platform guide yetDetails unavailable Linked platform guideHBO MaxPlatform guideView details Streaming providerDiscovery +No linked platform guide yetDetails unavailable
Free
1Streaming providerSpectrum On DemandNo linked platform guide yetDetails unavailable
Free with ads
4Streaming providerThe Roku ChannelNo linked platform guide yetDetails unavailable Streaming providerPlexNo linked platform guide yetDetails unavailable Streaming providerPlex ChannelNo linked platform guide yetDetails unavailable Linked platform guideTubi TVRelated brand guideView details
Buy
4Streaming providerAmazon VideoNo linked platform guide yetDetails unavailable Streaming providerApple TV StoreNo linked platform guide yetDetails unavailable Streaming providerGoogle Play MoviesNo linked platform guide yetDetails unavailable Streaming providerFandango At HomeNo linked platform guide yetDetails unavailable
Series schedule
Seasons and episode dates
A concise series timeline, including the latest aired episode and the next date currently listed.
- First aired
- Seasons
- 3
- Episodes
- 30
- Status
- Returning Series
Latest aired episode
S3 E10
Evil Sister Act
Aired 42 min
When Samuel Johnson Jr. suddenly vanishes, investigators find themselves face-to-face with two sisters who know something; through a series of interrogations, they reveal an elaborate murder plot meticulously engineered by a puppeteer.
Next listed episode
No upcoming episode date is currently listed.
Season guide
Most recent seasons first
Season 3
10 episodes
First episode aired
Season 2
10 episodes
First episode aired
Season 1
10 episodes
First episode aired
About these dates: Air dates describe the series schedule and may change. They do not confirm that an episode is available on the same date from the providers listed above.
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