Nikki and Tom are left at their Grandad's home by their parents, Grandad shows them some old films showing life at the seaside 100 years ago. The children want to find out more about the olden days and so they all walk into the projector screen and find themselves in 1901.

Tom and Nikki see film of a young Grandad swimming in the sea with an old-fashioned rubber ring, and his mother attempting to change under a towel. When they go back 100 years they immediately go off to find a bathing machine and change into their own old-fashioned swimming costumes.

Grandad takes Tom and Nikki back to 1901 to explore the attractions of the pier.