I work for a cable system operator in the midwest. In the summer of 2013, during a Thursday night block of Regular Show reruns, an episode aired that I have never been able to find in any episode guide, any streaming archive, or any fan database.
I only watched it because I was running a signal audit that night and had the feed up on a monitor. If I hadn't been doing the audit, I never would have seen it.
The episode opened with the standard Regular Show title card but no episode title beneath it. That was the first thing that caught my attention — the slot where the episode name normally appears was blank. Not missing; the space was there, formatted correctly, just empty. Mordecai and Rigby were in the park, as usual, arguing about something trivial. The dialogue was natural. J.G. Quintel's voice work sounded exactly right. For the first five minutes, I assumed I was simply watching an episode I hadn't seen before.
Then they found the door.
It was at the far edge of the park grounds, past the tree line, in an area that the show rarely depicts — a kind of undefined space the backgrounds artists used for distance. The door was standing upright with no frame around it, no wall attached to it. Old wood. Brass handle. Mordecai tried to talk Rigby out of opening it.
Rigby opened it.
What was on the other side is difficult to describe, partly because the background artists seemed to be intentionally withholding clarity. It was a space. Vast and interior at the same time, the way dreams are. The color palette was wrong for Regular Show — muddier, less saturated, closer to watercolor than the show's usual clean digital look. Things were in the space. Shapes that might have been furniture or might have been people sitting very still.
Mordecai and Rigby did not go through the door. They stood at the threshold for the remainder of the episode. They talked to each other in voices that were too quiet to make out clearly over the ambient sound of the park. The camera did not cut. It held on them from behind, facing the open door, for eleven continuous minutes.
At the end of the eleven minutes, they closed the door.
They walked back to the house. Benson was on the porch. He asked where they'd been. Rigby said, "In the park." Benson said "Whatever," and went inside. The episode ended.
I flagged it in my log and contacted Cartoon Network's technical operations department the next morning. Their response, after two weeks: no such episode exists. The timeslot had aired a standard rerun of "Caffeinated Concert Tickets."
I pulled my signal log. The log showed "Caffeinated Concert Tickets" for that block, runtime 11:02, which is correct.
What I watched had a runtime of 22:17.
I reached out to J.G. Quintel through a third party several months later with a description of what I had seen. The response I received back was brief. It said: "That episode was written once in a notebook. The notebook was lost during a move. I don't know how you saw that."
I have kept the signal log. I don't know what good it does me.