As no one remembers him now, Peter gets a problem in convincing Walter that he is his son and needs his help to know what went wrong.
Peter has finally returned on "Fringe", but that is not the end of the problem. Now that no one remembers him, Peter can hardly make people trust his words. When the show returns in two weeks, Peter asks Walter's help to figure out what went wrong, but Walter thinks Peter only brings back many things he's tried to forget.
While they are still not finding an answer for the mysterious re-appearance of Peter, the Fringe team also investigates "Truss Project" which refers to Malcolm Truss. The former Massive Dynamic scientist is forced by shape-shifter Seven to develop a serum.
Also in "Novation" which will air Friday, October 28 at 9/8c on FOX, Walter gets a visit in the lab from Nina Sharp. Arye Gross guest stars as Truss and Michelle Krusiec portrays Seven.