Plot:
By a strange quirk of fate, Raine Franklin and her little sister Wendy, had stumbled through the Spectrum Door which had led them to an invisible universe on the other side of the rainbow. But the door had vanished and there seemed no way back home again. To make matters worse, time was travelling backwards at incredible speed.
Notes:
Appeared:
- The Rainbow Girls – Bunty: #755 (1 July 1972) – #765 (9 September 1972)
- Reprinted as Prisoners Of The Rainbow – Bunty: #1206 (21 February 1981) – #1216 (2 May 1981)

“Prisoners of the Rainbow” ends in Bunty: #1216 (May 2, 1981).
This is a reprint. It was originally published as “The Rainbow Girls” beginning in Bunty #755 (July 1, 1972) and ending in Bunty #765 (September 9, 1972).
Thanks for the information