Night of the Frozen Undead

Night of the Frozen Undead (Japanese: 冷凍アンデッドの夜 Reitō andeddo no yoru) is the sixteenth episode of the second season of Scooby-Doo: The Next Mystery.

Summary
Up in Hokkaido, partly for fishing, partly to get some idea for a Monster in an upcoming Swashbuckler movie, Shaggy, Scooby, and Scrappy hook, of all things, a block of ice with a woolly mammoth inside. The kids take the frozen prehistoric elephant to the National Museum of Nature and Science. When they come back to the museum that night to retrieve Shaggy, Scooby, and Scrappy's fishing rods, they find that the ice has melted and the mammoth is now apparently alive and on a rampage.

Pleistocene Kamchatka Peninsula, Russia
A herd of mammoths are cornered on the edge of a glacier by a tribe of cavemen in the middle of a blizzard. The bulls bravely try and fight the cavemen off, but they are no match for the intelligence and weaponry of the cavemen. The lead cow meanwhile, notices that one of her calves are missing. She realizes that it has wandered off into the snow. She runs off to find him, only to be greeted with a storm of Spears. She manages to escape, but she falls to hypothermia. She makes a vow for her spirit to live on and protect her herd, and destroy the animals that took away the calf she loved before dying.

Holocene Hokkaido, Japan
Scrappy and Scooby are out fishing, while Shaggy is sitting nearby, sketching concept art for some monster, but keeps redoing it. But he's forced to stop when Scooby is jerked into the water.
 * He starts off with a large squid. "No, it's too cliche."
 * It turns into a hagfish-like sea monster. "Looks better, but still cliche. Maybe if I add a turtle shell, it would look better..."
 * It then becomes a sea turtle with a long neck. "No, i'm not ripping off Gamera. Maybe some croc features might do...."
 * Shaggy's sea monster is now a crocodile with some tylosaur features in there. "It's cliche again."

Japanese Cast

 * Naomi Kusumi as Scooby-Doo, Zombie Mammoth
 * Toshiharu Sakurai as Shaggy Rogers
 * TBA as Moshu
 * TBA as Shimagura
 * TBA as Mishi
 * Naoki Tatsuta as Scrappy-Doo
 * TBA as Nigamora
 * TBA as Toshi
 * TBA as Sergeant Otonato

English Cast

 * Frank Welker as Scooby-Doo, Zombie Mammoth
 * Matthew Lillard as Shaggy Rogers
 * Benjamin Diskin as Moshu
 * Gwendoline Yeo as Shimagura
 * Colleen O'Shaughnessey as Mishi
 * Scott Innes as Scrappy-Doo
 * Kari Wahlgren as Nigamora
 * Kyle Hebert as Toshi
 * Jennifer Hale as Dr. Gloria
 * Robert Costanzo as Sergeant Otonato
 * Dee Bradley Baker as Tai the Elephant

Villains

 * Dr. Gloria
 * Tai the Elephant/Zombie Mammoth (redeemed)

Notes/Trivia

 * The roars that the zombie mammoth makes are a mix of boar grunts and elephant roars and sounds.

Quotes
Moshu: Well gang, it looks like we've gotta "mammoth" mystery on our hands.