"What if I fail?"
"You won't fail, Walter."
"How can you be so sure?"
"Because you can't."
This is a bridging episode between where Fringe was and where it's heading, and the stakes have never been higher for our favorite mad scientist, Walter Bishop.
Like many in the series so far this is mainly a relationship episode, mostly about that bittersweet relationship that can exist between a father and son.
I always loved Greek mythology as a kid, so in the fourth scene, Walter's immediate reference to Icarus' flying to close to the sun and falling to the earth made me smile. It also made me alert. It wasn't just the famous Daedalus and Icarus father and son story we were talking about here, but most likely the foreshadowing of another father losing a son.(Yikes!)In a quick recap, Daedalus the designing father and his son, Icarus, were trapped in a labyrinth on the island of Crete by an evil king(long story). Daedalus came up with the idea of crafting a set of wings out of feathers and wax with which he and his son could escape. Before they did, Daedalus warned Icarus not to get too close to the ocean lest his wings get wet and malfunction, and not to get too close to the sun, lest the wax of his wings melt and he fall into the sea. Unfortunately, Icarus got carried away by the magnificence of flight and flew too close to the sun. The wax holding his wings together melted, and Icarus plummeted into the sea and drowned. There's no hard proof yet but I can't shake the feeling that this is foreshadowing of the fate of Peter Bishop sometime in the future of the series, not exactly in the manner of this myth, but similarly none the less.