Mysterons
I think I'm right in saying that before their work for the Benefits people, the Mysterons first appeared in the feature film 'Thunderbirds Are Go' where a rather tactless crew of the Zero-X spacecraft ( a forerunner of the runway / hypersonic / to orbit idea, on a grand scale ) spoiled their day.
They could presumably see into the Angels' locker room too ...
Can't wait to try those simulations of the G.Anderson craft, someone's obviously been to a lot of trouble ( or like me needs to get out more ) - be interesting to see how Fireflash is at rotate...
As I say I haven't tried these yet, but a critique of TB1 & 2 by Mr Farley would be fascinating - somehow I don't think it's going to happen !