Now, I know that the first thought is that the episode has to do with Zelena and her unborn baby. However, I think it actually has to do with Hercules. We know that they recently sent out a casting call for both Hercules and Megara. Not only that, but Hercules is known for his 12 labors, which could be what the title is referring to. “Labor of love” by definition means work done for the interest in the work itself, rather than for payment. Sounds like what it means to be a true hero, to me!