The Most Dangerous Animal of All | FX Networks

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THE MOST DANGEROUS ANIMAL OF ALL

The Most Dangerous Animal of All - Official Trailer

About the Show

Based on The New York Times best-selling book of the same name, The Most Dangerous Animal of All is a four-part documentary series on FX that explores one man's search for the father who abandoned him, only to uncover the worst: he believes his father is the Zodiac killer, one of the most infamous serial killers in American history.


Executive produced by Ross M. Dinerstein (The Innocent Man) and Academy Award®-nominated director Kief Davidson (The Ivory Game), The Most Dangerous Animal of All is an honest depiction of true life and true crime unexpectedly merging to upend one man’s understanding of his own identity.

Streaming on FXNOW

Season 1
Season 1

Sn.1 Ep.4

"The Truth"

LATEST Sn.1 Ep.4

The Truth

Expires in 37 days

Armed with DNA evidence that links his father to the Zodiac killer, Gary forges ahead to uncover his truth. A San Francisco-based private investigator digs into the claims. Presented by FX.

46 minutes • TV-MA • Aired 03/06

Sn.1 Ep.3

"The Discovery"

LATEST Sn.1 Ep.3

The Discovery

Expires in 37 days

Gary's story takes a turn when he realizes his book could be a betrayal of his biological mother. Gary goes up against a community of Zodiac fanatics with ulterior motives. Presented by FX.

40 minutes • TV-MA • Aired 03/06

Sn.1 Ep.2

"The Search"

LATEST Sn.1 Ep.2

The Search

Expires in 37 days

After learning that his father may have been the Zodiac killer, Gary brings in best-selling true crime author Susan Mustafa to help uncover more information about him. Presented by FX.

43 minutes • TV-14 • Aired 03/06

Sn.1 Ep.1

"My Identity"

LATEST Sn.1 Ep.1

My Identity

Expires in 37 days

Adopted as an infant, Gary L. Stewart always struggled with his identity. After 39 years, the life long search for his biological parents reveals a truth he never could have imagined. Presented by FX.

40 minutes • TV-14 • Aired 03/06


  • “In terms of straight documentary storytelling, this one gets a gold star for sure”
    - Forbes
  • “The Most Dangerous Animal of All is a must watch for me. Just with the lights on”
    - Awards Daily
  • “[The Most Dangerous Animal of All] will undoubtedly hook true-crime fans”
    - TIME
  • “It’s a heck of a story”
    - Paste