Second part of the "Chocky" trilogy based on John Wyndham's novel that began with Chocky (1984) and finishes with Chocky's Challenge (1986).
Both Prentis Hancock (Arnold Meyer) and Ed Bishop (Dr. Deacon) have been in previous Gerry Anderson shows. Prentis Hancock was in Space: 1999 as Paul Morrow and Ed Bishop was in UFO as Commander Ed Striker.