Macho, macho outdoors man shows are the new “Law & Order.” No — they aren’t maintaining order, but they are taking over TV with as many variations on a theme as possible — the way “L&O” did for decades.

Reality-TV macho men — who don’t breed well in captivity or civility — have been featured on TV series fighting gators, living with bears, digging for gold and surviving in extreme conditions in the wild among the scariest creatures on Earth.

Tonight, Discovery premieres “Swamp Brothers” — a great variation on the wild man theme. Two brothers — Robbie Keszey, a 1980s hair-band rocker, and his brother, Stephen, a NYC bartender and professional wimp — have formed a partnership.

Or, to be more accurate, Stephen has just invested in his brother’s Florida wild reptile farm — and has moved there to protect his investment. Clearly, he didn’t count on protecting his backside as well.

Stephen finds he’s forced into indentured slavery by helping his brother wrangle rogue alligators, hunt wild, dog-eating killer hogs in the dark and even entering a lion’s den to save a sanctuary’s dying lion — while the healthy mate rages, ready to kill them all.

As you watch Robbie wrangle and Stephen run like hell, you will laugh out loud and shrink in fear. In other words, you’ll go from hysteria to hys teria.

There’s one scene in tonight’s second episode, “Sex and the Single Gator,” where Robbie captures a rogue gator that’s been killing other gators. When they find a giant alligator with its tail partially bitten off, all hell breaks loose. When Stephen ties it up, and “examines” the sex organs, Robbie quips, “Do you at least take it out to dinner first?”

Hilarious — until he has to do it, too, and ends up screaming and throwing up. It’s like a real-life sitcom.

Next time, read the fine print, bro. Robbie’s working with killer snakes, not “White Snake” these days.