While Bob's Away, Robert Will Play is the tenth episode of the eleventh season.
Robert and Dot are visiting the Valley. Bob shows them around. Robert notices Bob’s old rubble chute. Bob explains that he will find a use for it. Robert and Dot stay at the valley to look after Sunny and Saffron – Marjorie’s children – who have no school!
Robert decides to build the kids a playground – just like Bob used to have, but can’t remember what toy Bob used to play with. Then Bob returns and is amazed to see Robert’s playground. Robert has converted his rubble chute into a slide like the one he used to have.