And guess fucking what? They are all connected!

Burger worked on science thing studying shadow stuff that is trapped inside Spender. Experiment Gone Wrong took him to the shadow realm/beccame the shadow where Spender had to trap inside him.

With his disappearance, Gramps took Ed in, but it looks like there is some black spectral baby there, so I guess Ed has a long lost brother.

And Isaac is like the birth of heaven or angels or something since 13 years ago something something magic.