He works with Anil (Shaun Smyth) of the human resistance to try to replace one of their briefcases with an identical one containing a bomb.
The video instructs them to obtain two of the Observers' "beacons" (as seen in "The Arrival"), which help to fix a point in space and time.
The video discloses two stored at Kelvin Industries (where Walter and former partner William Bell worked previously); entry to the storage area would require Bell's hand print, which explains why Walter had cut off William's hand after they had been released from the amber (as seen in "Letters of Transit").
Walter believes he knows the combination William used for everything (as mentioned in "Jacksonville"), but struggles to remember it, while Olivia insists time is short.
Olivia returns to Etta's safe-house to find Peter there, in front of several boards filled with dates, times, and photos of Observers.
Walter, alone with the assembled components from the tape, contemplates to himself listening to David Bowie's "The Man Who Sold the World" from the recovered album.
"Five-Twenty-Ten" was written by supervising producer Graham Roland and directed by Nikita veteran Eagle Egilsson.
Actress Blair Brown made a special guest appearance during the episode, after being a series regular since the pilot.
An estimated 2.7 million viewers watched the episode, and earned a ratings share of 0.9 among adults aged 18 to 49, to rank fourth in its timeslot.