This article contains plot spoilers for the 2017 series of Twin Peaks.
After Sonny Jim's father was absent for several days (missing his birthday in the process), he apparently returned. Dougie appeared to be in a catatonic state and Sonny Jim gave him a thumbs-up in the morning and helped him sit down at the breakfast table and eat his pancakes.
The next evening, Dougie came to Sonny Jim's room and sat with him, playing with his clap-activated lamp until Sonny Jim's mother angrily called Dougie down.
Later, Dougie was hospitalized and slipped into a coma after sticking a fork in an electrical outlet. Sonny Jim and his mother sat at Dougie's bedside and Bushnell Mullins soon arrived, followed by the Mitchum brothers, who brought food for them.
After Janey-E took Sonny Jim to the bathroom, they returned to find that Dougie was awake and much more alert. He took them to the Silver Mustang Casino, where he told them that he had to leave, but would return, albeit accidentally referring to Dougie in the third person. Sonny Jim watched as his mother – who had come to the realization that he was not Dougie – kiss him goodbye and thank him.
Soon after, Dougie returned to the home and embraced Sonny Jim and Janey-E, who were overjoyed at his return.