David Dickinson can be seen in the below clip recording what he thinks is a brand new TV show that he's to front.
Long Lost Treasure is that faux-show, which aims to reunite people with their long lost treasures, and David prepares to meet his first guests.
Alfie (played by Dec) and his wife hope their first car can be brought back to them with the help of David. They sold it 15 years ago to pay for their wedding and it holds special memories for the couple, specifically as it was the place they conceived their first child.
New owner Frank (played by Ant) arrives, but leaves host David shocked when his new show doesn't exactly go the way he was planning.
"You've done me like a kipper." David admits after the stunt's over and Dec reveals wo he is.
The full sketch will be shown on this Saturday's Ant & Dec's Saturday Night Takeaway, 7pm on ITV.
Tagged in Saturday Night Takeaway