Can someone refresh my memory of where i can find the story where he-man goes back in time and cannot find palace and he only knows that granamyr exists in the past.

Then he asks granamyr for help - they find their way home and then granamyr knew who heman was from that trip long ago.

I thought it was an episode and after watching all the volumes with granamyr and they are all different stories.

Was wondering if any of you know about it or know where the story exists.