Some info and a short description of this South Park episode on South Park Zone:
South Park - Grey Dawn is the tenth episode in the seventh season of the animated television series South Park. It originally aired on Comedy Central in the United States on November 5, 2003. In the episode, senior citizens are running over people in the city of South Park, causing them to lose their driver's licenses. Soon, the AARP comes to help them, using weapons. In the end, Stan, Kyle, Eric, and Kenny stop the senior citizens by starving them.
The second half of the episode and the name of the episode parody Red Dawn, a 1984 movie that depicted a group of small town Colorado kids as they resist the Cuban, Nicaraguan, and Soviet invasion of the United States.
South Park Spoiler Alert!
(The complete plot for this South Park Episode)
At the South Park Farmer's Market, Father Maxi is holding a memorial service for the nine people who died the previous day when they were run over by a senior citizen who still holds a driver's license. The proceedings are marred by another unfortunate senior related driving incident. Stan asks his father Randy why old people are still allowed to drive.The news covers the recent rash of senior related driving tragedies, mentioning the DMV was planning to suspend driver's licences from senior citizens over 70. Grandpa Marsh and the other seniors have a meeting at the community center to decide what to do. However, they forget what they were there for in the first place. When Randy finds out about the meeting he realizes that when the meeting is over, all the seniors will be driving on the road at the same time. Horrified by the thought, Randy goes into town and shouts out a cry of alarm, causing mass panic. He asks Gerald where the boys are, who tells him that the boys are playing street hockey. Randy manages to save the boys and they flee from the many cars recklessly wandering the streets, eventually hiding in an abandoned house. Moments later, the house gets overrun by seniors making wrong turns and going the wrong way.
When Randy finds out about the meeting he realizes that when the it is over, all the seniors will be driving on the road at the same time. Horrified, Randy runs into the town and the farmer's market and shouts out a cry of alarm, causing mass panic. He asks Gerald where the boys are. The boys are playing street hockey. As Randy runs toward the boys, Kenny spots all seniors driving. Randy manages to save the boys and they flee from the many cars recklessly wandering the streets, eventually hiding in an abandoned house. Moments later, the house gets overrun by seniors making the wrong turn and going the wrong way (even on the second floor). It is later revealed that despite Randy's warning, the seniors managed to run down even more helpless victims across South Park, sparking public outrage.
The state of Colorado has demanded all seniors turn in their driver's license and the seniors are unhappy. Stan's grandfather wants Stan to accompany him, in the car, to go and pick up his new Hover Round. All the boys accompany Marvin Marsh on the trip, theorizing they'll be safer if they are in the car. Marvin's driving is at the current senior standard of bad and Officer Barbrady pulls the car over and takes Stan's grandfather to jail. Randy is reluctant to bail his father out, but his father doesn't care, the American Association of Retired Persons is sending their aid.
During a class session later on, Mr. Garrison notices a large number of old people dropping out of the sky. The AARP has airdrop in reinforcements. They begin taking hostages and liberating their colleagues from the retirement home. They state that "The revolution is on" and begin to take over the town. To show they mean business, the AARP starts killing hostages.
More reinforcements arrive but then so does the Veteran military. The seniors list their demands: their driver's licenses, more Medicare, and keeping kids from skateboarding on the sidewalk. The AARP leader realizes they could even take over the whole country, and demonstrates, as does other members of his army, that they are willing to kill hostages to get their demands, but Marvin feels this is goes too far beyond their original demands. The children find their parents under lockup. Randy tells the boys that the seniors were able to organize so effectively because they get up earlier than everyone else, representing an advantage over their children, who prefer to sleep late. Randy then realizes that the children get up almost as early as the seniors, and are the only hope for getting the town back. Fleeing to the woods, the boys resolve to board up Country Kitchen Buffet in order to cut the seniors off from their food supply. The AARP plans on taking stronger action, but their plans are thwarted when they start collapsing from hunger outside of the locked Country Kitchen Buffet. The Army takes the town back and arrests the AARP. Marvin is turned back over to his family, but when Randy admonishes him for his actions, Stan rebukes Randy, telling him that the condescending manner in which he treated Grandpa like a child is one of the main causes that led to the crisis in the first place. Stan also tells his grandfather that he should be proud to be a senior, but he should realize that he is a killing machine when he is driving, an assessment that Grandpa accepts. As the reconciled family goes home, Stan mutters, "Dude, I h4t3 my family."