This is one of those predictable episodes that features children going into an old abandon mine. You can already guess what is going to happen so I will spare you the excitement. But the one thing that stands out in this episode is shown right at the beginning.
Mark is falsely accused of damaging a book belonging to the new school teacher, Mr Griswald. The school teacher uses corporal punishment and also accuses Lucas of not raising Mark properly. Mark and his friend, Billy, then skip school the following day and that is when they discover the abandon mine.
This episode is so predictable that it stirred very little interest. The plot is old and the outcome known. Nothing unique about this show.