He ran from her, and was never seen again.
Will disappeared through the portal, and they have no way to get him back.
That was not how the story would end.
Kim has to find him, but the portal is destroyed and nobody knows how to build a new one. They have to go back to basics by experimenting with dimensions, with physics...
With her.
Because, somehow, Kim's special abilities are tied into the technology that created the portal. Mike has theories she doesn't trust. Tonya has ideas she doesn't understand. Spencer has tech that's held together with bailing wire and duct tape. But Kim doesn't have a choice. They have to get Will back.
Meanwhile, on the other side of the galaxy, a brand-new D-ship pilot is waiting anxiously for her captain to return.