Debuts of Todd Carty as Peter "Tucker" Jenkins; George Armstrong as Alan Hargreaves (later re-named Humphries); Michelle Herbert as Trisha Yates; Terry Sue-Patt as Benny Green; Robert Morgan as Justin Bennett; James Jebbia as (the first incarnation of) Thomas Watson; Abigail Brown as Judy Preston; Lucinda Duckett as Ann Wilson; Christopher Hall as Winkle Graham; Julia Gale as Carol Yates; Miriam Mann as Jackie Heron; Michael Percival as English teacher Tony Mitchell; Dorothy Phillips as deputy head Mrs Monroe; Roger Sloman as P.E. teacher Mr Foster; Stella Haime as secretary Janet and Graham Ashley as caretaker Mr Garfield.
Paul Tropea, billed as playing a character named Patterson in every episode in S1&2, never appears in GH.
This was the first of 27 episodes to air in the 1970s.