Summer Splash is a stand-alone special followed by Really? It's Over?. The special had aired on August 20, 2016, and is the series finale.
School’s out at MacKendrick Prep and XO-IQ band members Sun Hi, Corki, Jodi and DJ Caleb are spending their summer at the world-famous Sparkview Resort after winning a spot as the hotel’s exclusive house band. Tempers flare and friendships are tested when the resort manager tries to steer the group in a new musical direction. But with the support and inspiration from some special guests, the band must find a way to put on the show of the summer.