It’s finally here! No, not Memorial Day weekend (though I’m not one to complain about a long weekend!). Monster Week is back for its fifth year, kicking off tonight, May 26 at 10/9c with an all-new episode of River Monsters.

Animal Planet’s most anticipated week of programming features everything from dangerous reptiles and an invasion of crocs to killer swarms, lions on the loose and bone-chilling 9-1-1 animal attack calls. There are a lot of unknowns about the dangerous animals lurking around the corner, but one thing’s for certain: there’s no shortage of jaw-dropping stories of some of the most menacing and merciless animals around.

Here’s what fans can look forward to throughout the week:

• Rabid: Rabies infect animals, turning their bites and scratches into an attack on the body that can leave its victims unaware of the absolute carnage awaiting their nervous system. Rabid explores the animals carrying the rabies virus and profiles three individuals and communities that were forever changed by the virus. Monsters Inside Me host/biologist Dan Riskin shares how this microscopic monster can be just as dangerous to a human as any animal they may encounter.

• 9-1-1 Encounters: This two part-special features real-life dispatch calls from some of the most terrifying and bizarre animal encounters on record. From coyotes stalking an unsuspecting hiker, thousands of birds inexplicably falling from the sky and two men attacked by a swarm of bees, these calls are sure to shock you!

• Yeti or Not: Dr. Mark Evans, a veterinarian and explorer, is on a mission to sift fact from folklore and distill the plausible from the possible as he searches for a rational explanation for the mysterious Himalayan biped known as the Yeti.

Also included in the network’s killer line up is: Lair of the Killer Crocs, Attack of the Killer Dragons, Killer Swarms, Urban Predator: Lion on the Loose, Extinct or Alive: Tasmanian Tiger, Weird, True and Freaky: Real Monsters, Grizzly Uprising and Deadliest Place on Earth. Viewers will also get a sneak peek of upcoming series The Vet Life and Lone Star Law during the weeklong programming event.

Monster Week will conclude with the season finale of River Monsters on Thursday, June 2 at 8/7c.

Be sure to follow #MonsterWeek across social media for all things beastly, and stay tuned for Facebook Live events featuring wildlife experts, animal feedings and Animal Planet talent — along with informative videos, graphics and articles — that reveal the science behind Monster Week.

To learn more, head to Animal Planet online.