|Season 1, Episode 15|
|Air date||February 10, 2017|
|Written by||Brian Durkin|
|Directed by||Stephen Herek|
When Matty’s goddaughter and her boyfriend are killed in a San Francisco park, Mac and the team investigate the crime and start to suspect that the 1970s Zodiac Killer has returned.
When Matty's goddaughter and her boyfriend are killed in a San Francisco park, Mac and the team investigate the crime and start to suspect that the 1970s Zodiac Killer has returned. The killer is later revealed to be working under the tutelage of a Dr. Madison Gray, who has been communicating with him from Oahu. Jack proceeds to give an old buddy of his who works on some task force in Hawaii a call about their findings.
- This episode takes place in San Francisco, America.
- This episode has several references to Hawaii Five-0. The serial killer/mentor in question is Madison Gray, a recurring character on Hawaii Five-0, and Jack's buddy is Commander Steve McGarrett, the leader of the Hawaii Five-0 Task Force.
- This episode is foreshadowing a crossover with Hawaii Five-0 titled Flashlight.
Matilda Webber: (as Mac MacGyvers something) What is Encyclopedia Brown up to?
Jack Dalton: Well, I never really know. It's part of his charm, I guess.
Angus MacGyver: Or I could just make my own Electrostatic Dust Print Lifter.
Matilda Webber: (as MacGyver does something) What are you laughing at, Dalton?
Jack Dalton: Well, I don't know.
Matilda Webber: You have no idea what he's doing, either.
Jack Dalton: You know how you get that faraway look in your eye when the wheels are turning in your head?
Angus MacGyver: No, not really.
Jack Dalton: Well, you do it all the time and I'm getting it.
Matilda Webber: You think you're thinking, Jack?