In the fourth season, Maria Bamford (Lady Dynamite) will voice as a mosquito. The pubescent teens go out camping in the fourth season and find this mosquito to be quite troublesome. She creates a lot of anxiety with her nervous behaviour.
Next to Bamford, Seth Rogen (Freaks and Geeks), John Oliver (Community) and Zach Galifianakis (Between Two Ferns) will have guest roles. Maya Erskine and Anna Konkle - the duo behind PEN15 - will be heard in the season that releases on Netflix on the 4th of December.
A fifth and sixth season have already been ordered by Netflix.