Despite the dozens of failsafes and backups that any nuclear plant in the U.S. has, a couple of bullet shots not only cause the reactor to go into meltdown, but damage the safety controls intended to stop the meltdown.
Amy explains that they'll die several minutes before the sludge get to the waste disposal chamber, because of the extreme heat that precedes it. However, they exit from the chamber and the sludge pours in immediately as soon as they leave.
MacGyver: Should make a heck of a press release, eh?
Tim: Just like our college days. Never a dull moment with MacGyver.
MacGyver: I hate heights, and I despise guns. So how the hell did I get myself up here?
Train: You can't run forever, MacGyver.
MacGyver: Train, are you crazy? We've got a runaway reactor to worry about here!
Train: That's what I'm trying to help you with: stop all that worryin'!
MacGyver: A marine sergeant once started a charge by yelling at his men, "Come on, you wanna live forever?" Now, I used to think that was about the guttiest thing ever said. But of course, the older you get, the more nervous you get.
MacGyver: So, if I can open it manually, we're home free, right?
Amy: Mac, no—it'll kill you!
MacGyver: No way... I haven't paid my taxes yet.
Amy: I think we oughta just run you for President or something.
MacGyver: Um, no thanks. I'd rather have this problem than his.
Amy: You always carried a pocketful of junk.
Amy: And you always fixed everything.
MacGyver: Amy, I took physics because it was interesting, and it excited me—not to buy myself a job. Amy, come on! There's a world out there: let's go look at it! Be something different.
Amy: I don't want to be different. I want a life I can count on.
MacGyver: The past is a strange country. You go back; it doesn't recognize you. I'd changed in ways I didn't know. And if I was a stranger, so was Amy.
MacGyver: Fourth time, eh?
Susan: Yeah, I like that accent.
MacGyver: What accent, eh?
This episode introduces MacGyver's love of ice hockey, mirroring star Richard Dean Anderson's own love for the game.
The scenes at Westport Nuclear Processing Corporation were filmed at the Terminal Island Treatment Plant in San Pedro.
The German episode title is "Alte Freundschaften", meaning "Old Friendships". The French episode title is "Atome Crochu", meaning "Hooked Atom". The Italian episode title is "Pericolo nucleare", meaning "Nuclear Danger".