**Chapter 3: A Glimpse of Trouble**

The sun rose over Radiator Springs, casting a warm glow over the town. Doc Hudson and Lightning McQueen were already up and about, preparing for another day of training. The Sailor Moon Gang, now comfortably settled in, decided to join them, eager to learn more about the world of racing. As they gathered at the track, Doc seemed a bit more subdued than usual. His engine didn't have its usual spark, and his voice was a bit more raspy. Lightning McQueen didn't notice anything out of the ordinary, but Rei's intuition was on high alert. She sensed that something was amiss, but she couldn't quite put her finger on what it was. The training session began, with Doc putting Lightning through his paces. The Sailor Guardians watched in awe as Lightning zoomed past, his engine revving smoothly. But Rei kept a close eye on Doc, her senses on high alert. As the session came to an end, Doc Hudson smiled, his eyes a bit more tired than usual. "Not bad, McQueen," he said, patting his trainer's car lovingly. "You're getting there." But Lightning noticed that Doc seemed a bit more lethargic than usual. "Hey, Doc, you okay?" he asked, concern etched on his face. "Yeah, kid, I'm fine," Doc replied, waving his hand dismissively. "Just a bit...tired, that's all." Rei stepped forward, her eyes locked on Doc's. "I think we should get you checked out, Doc," she said gently. "You don't seem quite yourself." But Doc Hudson was too proud to listen. "I'm fine, Rei," he said firmly. "Don't worry about me. I'm just a bit...overworked, that's all." The Sailor Moon Gang exchanged worried glances. They had grown attached to Doc and didn't want to see him get hurt. But Doc was stubborn, and he refused to listen to their concerns. As the day went on, Lightning McQueen began to feel a bit uneasy. He had never seen Doc like this before, and he didn't know how to react. He pushed the thought aside, focusing instead on his own training. The Radiator Springs gang and the Sailor Moon Gang spent the rest of the day together, sharing stories and laughter. But the atmosphere was tinged with a sense of unease, as if everyone was waiting for something to go wrong. As the sun began to set, Doc Hudson excused himself, citing fatigue. The group bid him a gentle goodnight, but Rei's eyes lingered on him, her senses still on high alert. "I don't think he's okay," she whispered to the Sailor Moon Gang as they walked away. "We need to keep an eye on him." The Sailor Guardians nodded in agreement, their faces set with determination. They would do everything in their power to help their new friend, Doc Hudson. Meanwhile, Lightning McQueen was still oblivious to the trouble brewing. He was too focused on his own training, too driven to notice the subtle signs of Doc's illness. But as he drifted off to sleep that night, he couldn't shake the feeling that something was off. He had a nagging sense of unease, a feeling that would only grow stronger as the days went by. The friendship between the Radiator Springs gang and the Sailor Moon Gang continued to blossom, but a shadow loomed on the horizon, threatening to disrupt their happiness. And Lightning McQueen was about to face the biggest challenge of his life.