The Boxcurse Children Clarence, Jeff, and Sumo stumble upon a mysterious box. After they open it, some strange things begin to happen. Convinced they’ve unlocked a curse, they become determined to reverse it! Details Casts Videos Galleries Posters Season Lists Title The Boxcurse Children Genres Animation Comedy Release Date 2017-06-08 Episode Runtime 00 Hours 11 Minutes Season Number 3 Episode Number 13 Production Companies Cartoon Network Studios Spencer Rothbell... Clarence / Camden / Mavis... Tom Kenny... Sumo (voice)... Sean Giambrone... Jeff (voice)... Katie Crown... Mary / Ms. Baker / Ms. Sh... Eric Edelstein... Chad (voice)... Roger Craig Smith... Belson / Percy (voice)... Title Sequence (Opening Credits) First Look (Clip) Sneak Peek (Clip) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (1920x1080) Original Size (3200x1800) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (1920x1080) Original Size (3840x2160) Original Size (3840x2160) Original Size (2000x3000) Original Size (2000x3000) Original Size (960x1440) Original Size (1000x1500) Original Size (1175x1763) Season 1 51 Episode(s) 2014-04-14 Season 2 38 Episode(s) 2016-01-18 Season 3 40 Episode(s) 2017-02-10