Sam and Jack are tired of Dani always ditching them for auditions and try-outs, so she promises them faithfully that she won't let them down again. When the perfect audition clashes with a date with her mates, Dani has to find a way out fast. Luckily she runs into Maggie, who could be her double. Maggie agrees to stand in for Dani but soon turns out to be more trouble than Dani could have imagined, especially when she starts advising Max and Ben on their project to build a moon rocket.