Robby and Mo are super bummed--their Terran siblings are going on a top-secret undercover mission with Bumblebee, but they have to stay behind to finish a book report. Even though they are stuck at home, Robby and Mo decide to make their day a lot more interesting with a little help from Nightshade's Smart Trainer 5008. But when the Smart Trainer spins out of control, Robby and Mo must think about what responsibility really means. Since they got themselves into trouble, can they find a way out on their own?