As noted, I've been watching the Brave and Bold again, and while doing so I realized I hadn't seen this episode. I looked through all five sets and it was not to be found. This is just enough to annoy the completist in me, so of course, I have to do some research about it. How vexing!
Turns out it's on the final volume of the series, but it's listed as a "digital comic" on the box. I wonder how or why this happened, since it's the only one like that. I'm glad all the episodes are on DVD. If you want to see my recap of the show, click here. Here's the song to enjoy.