This instalment was originally published in Look and Learn issue no. 687 on 15 March 1975.
The Heat Controller (continued . . .)
This instalment was originally published in Look and Learn issue no. 686 on 8 March 1975.
The Elixir of Youth (continued . . .)
This installment was originally published in Look and Learn issue no. 651 on 6 July 1974.
