Episode 52 of The Trigan Empire
aka The Mission of Lukaz Rann (The Collection)
De gelofte van Lukaz Rann (Dutch title)
The Vow of Lukaz Rann (Dutch title, translated)
The Rocketeer was originally published in 10 installments in issues 699 (7 June 1975) to 708 (9 August 1975) of Look and Learn magazine.
It is reprinted in the Don Lawrence Collection Volume 11, The Sun-Worshippers.
Plot summary (Dutch)