Tread Perilously jumps to another reality with the abandoned Fringe episode known as "Unearthed."

When Lisa, a recently deceased young woman, suddenly comes back to life on the organ harvesting table and blurts out nuclear codes, Olivia Dunham and the Fringe Division arrive on the scene. When Lisa starts speaking Russian, the group investigates a missing Naval officer with access to the launch codes. Meanwhile, Walter Bishop begins to suspect the girl somehow caught the Navy man's soul as he lay dying. This doesn't stop her from noticing how handsome Joshua Jackson is. Unfortunately, the Navy man figures out a way to possess Lisa and plans his revenge.

Sarah Madden joins Erik and Justin for a look at the season one Fringe episode FOX held back and burned off in season two. She deduces star Anna Torv is Australian almost immediately. Justin points out the Oz actors on the show. Erik points out the Law Order veterans. The two points converge with Erik's "favorite" actor, Kirk Acevedo. Erik determines Anna Torv's Elvish origins. Justin professes his love for Diego Luna. Sarah drops truthbombs about Katie Holmes and cream soda. She also learns about Fringe's fantastic and convoluted meta-narrative.