Sure, here's a possible plot for a new episode of Two and a Half Men with Uncle Charlie still alive:

Title: Uncle Charlie Returns

Summary: Alan and Walden are shocked to receive a phone call from Uncle Charlie Harper, who they thought had passed away years ago. Charlie explains that he faked his own death to escape some dangerous people who were after him and has been living a secret life in Mexico ever since. Now that the dust has settled, he wants to reconnect with his family and help out with the business.

As Alan and Walden struggle to process this news, Uncle Charlie wastes no time in taking over the house and making himself at home. He charms Evelyn with his old-fashioned manners and wins over Berta with his smooth talking. He even manages to impress Jenny, who has never met him before.

However, things take a dark turn when the people Charlie was running from finally catch up with him. They demand a ransom for his safe return and threaten to harm his family if he doesn't comply. Charlie reluctantly agrees to their demands but secretly asks Alan and Walden for help.

Together, the three of them come up with a plan to outsmart the kidnappers and rescue Uncle Charlie. In the end, they succeed, and Charlie is reunited with his family once again.

Uncle Charlie Quotes:

- "You can't keep a good man down, but you can damn sure try."

- "Living in Mexico may not be glamorous, but at least I'm living on my own terms."

- "If I were any tougher, I'd be a steak."

- "I may be old, but I've still got a few tricks up my sleeve."