"So what's going on this time?" Daphne asked as the van bobbed and weaved its way through California traffic.

"Do you remember Sabrina Sargent?" Velma asked. "We helped her solve a mystery at the skateboarding park in Coolsville a few years back."

"Like, I remember that," Shaggy chimed in from the back. "We, like, never got our ice cream we were promised."

"Rhy ranted rhocolate!" Scooby pouted.

In the front seat, Fred, Velma and Daphne rolled their eyes. "Oh, you two!" Velma scolded. "Anyway, Sabrina was working with skateboarding legend Tony Hawk to reopen a defunct skate park and—"

"We get to meet Tony Hawk!?" Fred exclaimed. "Too cool!"

In his excitement, he accidentally jerked the wheel too hard and spiraled into the far lane. Car horns blared as Fred struggled to regain control of the car.

In spite of that, the gang managed to arrive safely at Oasis Skate Park in San Diego. "Hey, look, there's Sabrina," Velma called, waving at their old friend.

Sabrina skated over to greet them. "Oh my gosh, it's been forever since I've seen you!" she gushed excitedly. "Tony, these are the mystery-solvers I told you about." She frowned. "…now, you're going to have to help me. That's Fred…and Velma and Daphne, right?" The trio nodded their approval. "And that's…uh…Scaggy and Shooby-Doo?" Realizing her mistake, she quickly backpedaled. "No, wait, reverse it, Shaggy and Scooby-Doo!"

"And you're here to help us with this skateboarding monster?" Tony asked dubiously.

"They're professionals!" Sabrina exclaimed quickly. "Oh, Tony, you should've seen their work dealing with the Skate Monster at Pollywog Park!"

"…Skate Monster…" Tony frowned, still grappling with the fact that 'skateboarding monsters' apparently appear on a regular basis.

"So how did you end up here, Sabrina?" Daphne asked, strapping violet kneepads over her lavender leggings. "Last we heard, you were still managing Pollywog Park."

With a wistful sigh, Sabrina frowned. "It's a sad story, I'm afraid. After Gregory Bly got out of jail, he and Ms. Higgenbotham teamed up to force through a little-known loophole in the zoning laws and…" She swallowed hard. "…and they shut us down."

"I'm sorry to hear that," Fred said, unsure of how to comfort their old friend.

Sabrina brightened. "Well, it all worked out in the end. After we closed, I worked with the Tony Hawk foundation to raise the funds for a new park — one that wouldn't violate zoning laws."

"Jinkies, that's great!"

"And after we opened, I was offered a job at the Foundation; I'm Executive Director now!"

As the gang offered their congratulations, Shaggy and Scooby, now just a green-and-brown blur, suddenly skated past them on their skateboards.

"Like, cowabunga, Scoob!" Shaggy exclaimed, exchanging a high-five with his buddy. But his joy was short-lived as his board hit a low-slung grinding rail, causing him to tumble painfully into a concrete wall. The group winced in shared pain as poor Shaggy stumbled to his feet. "Like, who put that there?" he mumbled woozily.

"Hey, Hawk!" came a shout, causing the assembled group to look up as a man in a green shirt and jeans performed a kickflip off the half-pipe and skidded to a halt next to Tony. His dark brown hair was tucked under a black baseball cap and his chin sported a fledgling beard. His keys jingled as they swung to-and-fro on his belt loop.

"Hi, Ace," Tony mumbled unenthusiastically.

"Whoa, what a welcome, Hawk," Ace whistled. "Are you still jealous that I took you out of the X-Games two years ago?"

"Oh, geez," Tony moaned. "If memory serves, I actually recall kicking your flank at the X-Games," he fired back with a teasing grin.

Ace drew back and raised his hands in mock surrender. "Ooh, watch the attitude, Hawk. You never know when someone might…clip your wings!" And with that, Ace skated off with a mocking laugh.

"Who was that?" Velma asked.

"That's Alan Jackson, but he prefers to be called 'Ace,'" Tony replied.

"Do you think he could be the monster?" Fred interjected.

Tony frowned. "Ace? Hmmmm…we've always had a friendly rivalry, but this…this seems a little much for him."

"Uh oh," Sabrina gulped. "Here comes more trouble now."