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BigBadShadow22
Since: Oct, 2021
22nd Mar, 2022 11:30:42 AM
I believe you are thinking of Two Lines, No Waiting.
When a media has an A plot and B plot/when each episode of the media has an A plot and B plot. ex: Phineas and Ferb has an A plot of the titular characters doing their thing while Perry does his thing in the B Plot.