In "Normal Older People", the pair revisits Connell and Marianne 40 years in the future.
Comic Relief co-founder Richard Curtis explains, "It is imagining what would have happened to Marianne and Connell 40 years from now. I promise you, these are two very special bits... It's so much better than anything we've ever made."
He also teases a guest star, who will appear in the skits when they debut on Friday night (June 26) as part of Ireland's RTE Does Comic Relief.
"Normal People" became a huge international hit earlier this year when the BBC production debuted on streaming service Hulu.