The periodic table of elements in the Jacksonville daycare center in 'Subject 13' displays the element Osmium, the element featured in 'Os'.
A control box in 'OS' has a logo for "Gray Electric" with a lightning bolt symbol. This foreshadows the main suspect in 'Stowaway', Dana Gray, who had been struck by lightning multiple times.
FRINGE DIVISION CASE FILE #316-31111
FRINGE EVENT: Antigravity molecule
CLASSIFIED CASE CONNECTION(S): N/A
AGENTS ASSIGNED: Dunham
SUPERVISING AGENT: Broyles
FILE ARCHIVED BY: Scott Walker, Devan Nolen
WITNESSES/CONTACTS: Security guard, Bill [redacted], Dr. Krick (suspect), Michael Krick
LOCATION: MA Metal Depository, Doyle St., Museum of Science
VICTIM(S): Koenig (deceased), Bill [redacted], Vince [redacted]
CASE REPORT SUMMARY:A security guard shot a floating thief at the MA Metal Depository. The guard said he found two men coming down from the roof. The victim's calf muscles were extremely atrophied. In the lab, Dr. Bishop discovered that the thief had a weakened immune system and rapidly depleting buoyancy that made his remains weigh a ton. Dr. Bishop found osmium mixed with lutetium in the thief's body. The elements were traced to Dr. Krick, who worked in aeronautics. He was contracted to develop a new alloy for military aircraft, a metal dense enough to keep pilots safe from ground fire, but still allow for flight. When he combined the two elements, the result was unexpectedly a new molecule lighter than air.