Sam is visited by a mystery astronaut sent by Nasa, who puts her through various tests as part of her application to become an astronaut. When Jack announces he is leaving on a world-sailing trip, Dani and Ruby organise a nautical-themed goodbye party.

Jack has a new pen pal from Japan named Kashuro. Worried Jack isn't sufficiently cool, Dani sends him secret emails, making Jack sound amazing. Then Kashuro turns up out of the blue. How will Dani and Jack convince Kashuro that all Dani said was true? Maybe with the help of Jack's robot butler, Ben?