Ok this is really random but it came up during a conversation about that new retro release of a spectrum computer.
I remember a game when I was a kid - on one of our computers - a text based adventure game but with pictures done in ascii at the time. But it was one of those "go north" "examine pedestal" type games.
But during the game you could say a word at any time and your character would change into a super hero. Or back again. And you had to type a word like "khazam" or "kapow" or something odd like this.
PLEASE tell me I did not dream this and someone remembers this game

The bet I have with my mates was this was a ZX spectrum game. My mate thinks it was an Atari ST one. And my brother believes it was one of the first text games on the PC.