Looks like this is how Lincoln Lee is going to be integrated into the team.
THE FRINGE TEAM TAKES NEW SHAPE AS THE IMPACT OF PETER'S HEROIC CHOICE UNFOLDS IN THE FOURTH SEASON PREMIERE OF "FRINGE" FRIDAY, SEPTEMBER 23, ON FOX
Just one week after Peter Bishop saved the day and was then wiped from existence, the truce between the two worlds remains intact and the two sides are forced to work together. Lincoln Lee joins the Fringe team as they investigate a shapeshifter case that is very personal to him in the "Neither Here Nor There" season premiere episode of FRINGE airing Friday, Sept. 23 (9:00-10:00 PM ET/PT) on FOX. (FR-401) (TV-14 L, V)
Cast: Anna Torv as Olivia Dunham; Joshua Jackson as Peter Bishop; John Noble as Walter Bishop; Lance Reddick as Phillip Broyles; Blair Brown as Nina Sharp; Jasika Nicole as Astrid Farnsworth; Seth Gabel as Lincoln Lee
Guest Cast: Joe Flanigan as Robert Danzig; Shauna Johannesen as Julie Danzig; Charlotte Williams as Amy Danzig; Sean Michael Kyer as Jonathan Danzig; Stephen Lobo as Agent Frazier; Colin Lawrence Agent Roach