.Milo Ventimiglia has joined the upcoming season 4 of the Amazon Prime Video series as a guest star, a rep for confirmed to ET. Details on his character, however, are being kept under wraps.Ventimiglia's casting reunites him with creators Amy Sherman-Palladino and Daniel Palladino, with whom he worked for several seasons during its original run and the subsequent 2016 four-part sequel series. Back at the 2018 Primetime Emmys, the team shared that the door is always open for Ventimiglia to join