Help me identify this episode from my youthful viewing
I recall seeing an episode during my childhood, but I have no idea what the title is. Here's what I remember of the climax:
Jimmy, Lois, and maybe Superman are trapped in a kind of outdoor pit. There may be a machine spraying kryptonite into the air, which keeps Superman at bay. Jimmy stretches out his limbs and climbs up the wall of the pit in spread-eagle fashion. He finally reaches the top of the pit and is able to disable the kryptonite machine. As a youngster, I found Jimmy's climbing up the walls of the cave to be truly scary. I haven't seen this episode in decades, so I have no idea what the title was.
Does this ring a bell for anyone here?