Tony Hale
Nicholas Benedict / Mr. Curtain (16 eps)
Kristen Schaal
Number Two (16 eps)
Mystic Inscho
Reynie Muldoon (16 eps)
Seth Carr
George 'Sticky' Washington (16 eps)
Marta Timofeeva
Constance Contraire (16 eps)
Emmy DeOliveira
Kate Weatherall (16 eps)
Maameyaa Boafo
Rhonda Kazembe (8 eps)
Ryan Hurst
Milligan (8 eps)
Gia Sandhu
Ms. Perumal (8 eps)
Ben Andrusco-Daon
Isaac (4 eps)
Luke Roessler
Nicholas / Nathaniel (1 eps)
Lex King
Ilsa (1 eps)
Haley Joel Osment
One (1 eps)
Harriet Sansom Harris
Rowena (1 eps)