It's Mothers Day, and Jet wants to do something special for Celery, who just wants to finish her book. She suggests a day where Jet finds his own missing things. Jet agrees it would be the perfect gift, but first he needs her to fly them to Mars, so he can find his missing robot, Jet 2, that he left there!It's the first windy day of spring at Boxwood Terrace, and the kids are all trying out their new kites - all but Sean, who's stuck in his room with a cold. Sunspot joins Sean and helps him work out engineering problems so he can entertain himself - and even fly a kit from his room!