Little Einsteins premiered on Playhouse Disney in 2005 and followed Leo, June, Quincy and Annie as they traveled in their ship Rocket to solve musical missions. Leo, voiced by Jesse Schwartz, acted as the conductor and would call blast off to start each journey, making the line one of the show's most repeated cues. Clips of the series later resurfaced on YouTube and soundboards, where the short, enthusiastic shout became a reusable reaction for launches, departures and playful countdowns long after the show ended in 2009.