Scarecrow Video is completely evil

Actual Captain Scarlet dialog:

  COL. WHITE:
     There goes a brave man.

  LT. GREEN:
     Easy to be brave when you're indestructible

  COL. WHITE:
     Now, now.  That's quite enough of that!

This would be the episode "Attack on Cloudbase" a.k.a. "Everybody Dies", or #30 out of 32. Methinks after 29 episodes, the writers were finally getting a bit frisky.

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And for today, just in case you were wondering what Gareth Thomas did prior to Blakes 7, we have

Star Maidens (1976)

which, as an added bonus, also contains the answer to the enduring mystery of what happened to all of the left-over sound effects from Space: 1999.
And also the left-over turtleneck-cleavage shirts.
( Just in case you were wondering... )