From Season 3 Episode 10. "Terra Firma Part II"
A Little Background on the TOS "The City on the Edge of Forever", where Carl (The Guardian) is from:
The original script from Harlan Ellison called for Guardians that protected an ancient portal way. What you see in this shot.
Due to budget reasons, they had to shrink it down to what you see in the original TOS episode. So the Guardian was just a portal itself. The Discovery writers, took both scripts and basically combined both ideas. A humanoid portrayal of the Guardian with sentience and decision; At the same time, Carl being the portal himself.
It was done very well. It respected TOS, as well as Harlan Ellison's original idea.
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