“The Bridge” is episode ten of season one of Marvel’s Agents of S.H.I.E.L.D.
This episode references the first episode, “Pilot”, in which the Centipede serum was first discovered, and episode five, “Girl in the Flower Dress”, when it was being developed further by unknown parties.
The man (Po) seen in prison at the end of the latter episode, is being held in Havenworth Federal Penitentiary and is broken out at the start of this one.
Mike Peterson, who was being tested with Centipede in “Pilot”, also returns. The serum he took has apparently been stabilised, and people are no longer exploding when they take it.
The team does seem to get around awfully fast in that whatever-it-is plane they use.
The story doesn’t conclude in this episode, but continues in the next, “The Magical Place”.