Bernard can't wait to get his watch back when he arrives back from America, but finds it needs to be repaired, and in the meantime is given an alarm clock by the Postman. Everyone is wondering why Bernard came back home.

After receiving an unexpected visit from the Postman, Sam accidentally messes up her future. Can she correct her mistake to put the course of time right again?

Bernard's Grandad has been arrested for a series of strange crimes. Bernard uses his watch to find out what has happened, and everyone is amazed to discover who the real culprit is.

Bernard uses his watch to help people with their injuries. But when his teacher Mrs. Spindell sees him with his watch, she tells him not to bring it to school because it is valuable, but when he brings it anyway, she sends him to the headteacher.

A group of unlikely detectives spy on Sam as she uses the watch, and think she may be some form of mutant.

The Postman is distraught when his van runs away through time, as it may lead to him losing his job. Bernard soon helps to retrieve it, however - but in the process, he has a terrifying vision of the future. Is his destiny as dark as it appears?

Bernard receives a model train, but has no tracks to see it run on. He makes a friend in someone with a large model railway, Mr. Arnold. But when Mr. Arnold finds a note from his wife saying she's left him, can his knowledge of trains and Bernard's watch help save their marriage?

Sam tries to cure her aunt Rowena of worrying all the time by trying to get her to try high-risk activities, but she is too worried. But when Sam ends up in danger, can her aunt get over her fears to save Sam?

Bernard and Sam like to use a local hotel swimming pool. But one day, the hotel is in danger of being closed due to lost mice. Can the magic watch help?