Narrator Ryan Reynolds celebrates nature’s outcasts in the new NatGeo docuseries Underdogs.

Most of us have seen a nature documentary or two (or three) at some point in our lives, so it’s a familiar format: sweeping, majestic footage of impressively regal animals accompanied by reverently high-toned narration (preferably with a tony British accent). Underdogs, a new docuseries from National Geographic, takes a decidedly different approach. Narrated with hilarious irreverence by Ryan Reynolds, the five-part series highlights nature’s less cool and majestic creatures: the outcasts and benchwarmers, more noteworthy for their “unconventional hygiene choices” and “unsavory courtship rituals.” It’s like The Suicide Squad or Thunderbolts*, except these creatures actually exist.

Per the official premise, “Underdogs features a range of never-before-filmed scenes, including the first time a film crew has ever entered a special cave in New Zealand—a huge cavern that glows brighter than a bachelor pad under a black light thanks to the glowing butts of millions of mucus-coated grubs. All over the world, overlooked superstars like this are out there 24/7, giving it maximum effort and keeping the natural world in working order for all those showboating polar bears, sharks and gorillas.” It’s rated PG-13 thanks to the odd bit of scatalogical humor and shots of Nature Sexy Time.

Each of the five episodes is built around a specific genre. “Superheroes” highlights the surprising superpowers of the honey badger, pistol shrimp, and the invisible glass frog, among others, augmented with comic book graphics; “Sexy Beasts” focuses on bizarre mating habits and follows the format of a romantic advice column; “Terrible Parents” highlights nature’s worst practices, following the outline of a parenting guide; “Total Grossout” is exactly what it sounds like; and “The Unusual Suspects” is a heist tale, documenting the supposed efforts of a macaque to put together the ultimate team of masters of deception and disguise (an inside man, a decoy, a fall guy, etc.). Green Day even wrote and recorded a special theme song for the opening credits.

Co-creators Mark Linfield and Vanessa Berlowitz of Wildstar Films are longtime producers of award-winning wildlife films, most notably Frozen Planet, Planet Earth, and David Attenborough’s Life of Mammals—you know, the kind of prestige nature documentaries that have become a mainstay for National Geographic and the BBC, among others. They’re justly proud of that work, but this time around the duo wanted to try something different.

“There is a sense after a while that you’re playing the same animals to the same people, and the shows are starting to look the same and so is your audience,” Linfield told Ars. “We thought, okay, how can we do something absolutely the opposite? We’ve gone through our careers collecting stories of these weird and crazy creatures that don’t end up in the script because they’re not big or sexy and they live under a rock. But they often have the best life histories and the craziest superpowers.”

Case in point: the velvet worm featured in the “Superheroes” episode, which creeps up on unsuspecting prey before squirting disgusting slime all over their food. It’s a handy defense mechanism, too, against predators like the wolf spider.

Once Linfield and Berlowitz decided to focus on nature’s underdogs and to take a more humorous approach, Ryan Reynolds became their top choice for a narrator—the anti-Richard Attenborough. As luck would have it, the pair shared an agent with the mega-star. So even though they thought there was no way Reynolds would agree to the project, they put together a sizzle reel, complete with a “fake Canadian Ryan Reynolds sound-alike” doing the narration. Reynolds was on set when he received the reel and loved it so much he recorded his own narration for the footage and sent it back.

“From that moment he was in,” said Linfield, and Wildstar Films worked closely with Reynolds and his company to develop the final series. “We’ve never worked that way on a series before, a joint collaboration from day one,” Berlowitz admitted. But it worked: the end result strikes the perfect balance between scientific revelation and accurate natural history, with an edgy comic tone.

That tone is quintessential Reynolds, and while he did mostly follow the script (which his team helped write), Linfield and Berlowitz admit there was also a fair amount of improvisation—not all of it PG-13. “What we hadn’t appreciated is that he’s an incredible improv performer,” said Berlowitz. “He can’t help himself. He gets into character and starts riffing off [the footage]. There are some takes that we definitely couldn’t use, that potentially would fit a slightly more Hulu audience.” Some of the ad-libs made it into the final episodes, however—like Reynolds describing an aye-aye as “if fear and panic had a baby and rolled it in dog hair”—even though it meant going back and doing a bit of recutting to get the new lines to fit.

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