text: Long John Baldry as the Great Heep, Roto
  Lesleh Donaldson as Kea Moll
  Chris Wiggins as Mon Julpa
  Stephen Ouimette as the narrator
  Winston Rekert as Tig Fromm
  Other guest stars include George Buza, Andrew Sabiston, Eric Peterson, Jamie Dick, Donny Burns, Alan Fawcett, Don McManus, and Gordon Masten.
  Production and broadcast
  The series was produced by the Canadian company Nelvana for Lucasfilm. Several episodes were written by Star Wars sound designer Ben Burtt. Hanho Heung-Up Co. was the Korean company hired to animate the series.
  In the UK, BBC Television bought rights to screen the series in its entirety between 1986 and 1991 as part of the Children's BBC programming strand. The entire series was shown twice within this time (in 1986 and 1988 to coincide with the full release of the Star Wars trilogy as well as Droids on VHS). The Great Heep only made one showing in 1989 on BBC's Going Live!, which was a Saturday morning children's show—it was split into two parts over two weeks. Different episodes from different cycles were also screened across the five-year licence, with the Trigon cycle being shown in full in early 1991 on another Saturday morning children's show called The 8:15 from Manchester.