OK, folks. Congratulations to all those of you who have worked out the highlighting and well done.
I, however, am in the "quietly fuming" and desperately grid-staring category of solvers. I have accurately solved all of the clues, including the 5 undefined but thematic. I also have the message HIGHLIGHT KALEL IN RED AND THIRTY-THREE CELLS IN YELLOW. I was expecting to come up with the chest-mounted emblem of the well known "underpants-outside-trousers" superhero from KRYPTON.
I've stared in vain for contiguous cells spelling out SUPERMAN, CLARK KENT and MAN OF STEEL. Now could some kind soul please put me out of my misery by explaining, without obfuscation, what I should be looking for and where it is in the grid?