Ah, "Arthur Goes the Camp; Buster Makes the Grade"... this was actually the very first episode of Arthur I ever saw back in 1998.
I know the show began in 1996, but my PBS didn't actually start airing it regularly until 2000 or so, so I only saw it on VERY rare occasions (that first occasion, then a couple of others in 1998 for "Binky Barnes, Art Expert; Arthur's Lucky Pencil" and "Sue Ellen's Lost Diary; Arthur's Knee").
But I've noticed two things interesting about this episode, considering it's part of the series' timeline: already, there's an unusual fascet of Brain's character (aside from being hydrophobic, and being held back in kindergarten) in that he's a comic book nerd. And despite trying to pull a prank on Prunella, Binky isn't much of a bully in this episode, and this was before he became one of the guys and wasn't such a bully.