Indeed. The fact that the comet is green reminded me of the "green mist" which trailed the capsules launched by the Martians.
Of course, the segment of the intro I quoted was narrated by the late Richard Burton. Lead vocalist for the sung portions was Justin Hayward of the Moody Blues.
Correct you are.
And, Parson Nathaniel was none other than Phil Lynott, lead man of Thin Lizzy.
I had that LP when I was a lad, and most recently, found it online, and it is securely on my Ipod now....ULLA