Guest Stars Steve Alterman voices Additional Voices Mae Whitman voices Heather Mitch Carter voices Additional Voices David Faustino voices Dagur Michael Goldstrom voices Trader Johann Hakeem Kae-Kazim voices Krogan Paula Jane Newman voices Additional Voices Alastair Duncan voices Additional Voices Alan Shearman voices Additional Voices David Tennant voices Spitelout Jorgenson Adelaide Kane voices Mala James Arnold Taylor voices Throk Julie Falls voices Additional Voices Neil Dickson voices Additional Voices Edie Mirman voices Additional Voices T.J. Miller voices Gruffnut