In the fourth season of this NBC spy series, Chuck (Zachary Levi) decides to return to the agency and embarks on an odyssey to find his mother (Linda Hamilton) with the help of Morgan (Joshua Gomez); still, he has yet to tell Ellie (Sarah Lancaster) what he does for a living. Nicole Richie, Olivia Munn and Dolph Lundgren join a roster of guests, which includes Rob Riggle as an eternal optimist and loose-cannon recruit.

16. Chuck Versus the Masquerade - Valentine's Day is interrupted when Chuck and the team are sent on a mission to England to protect a reclusive young heiress, Vivian McArthur. Meanwhile, Casey gets an offer from the mysterious Jane Bentley. Back at home, Ellie and Awesome find an unlikely solution to a parenting problem, as Morgan ponders a big move. 4.55 stars (Dale-4.5, David-4.6)

17. Chuck Versus The First Bank of Evil - Chuck encourages Vivian to get in touch with her inner villain for a mission; Morgan's search for a new roommate has unexpected results. 4.55 stars (Dale-4.5, David-4.6)

18. Chuck Versus The A-TEAM - Chuck and Sarah begin to investigate when they suspect that Casey is carrying out private missions. Meanwhile, Chuck fears that the CIA's seemingly-perfect new operatives will render him obsolete. Elsewhere, Morgan settles in with a new roommate, and Awesome panics when Ellie embarks on a potentially dangerous line of research. 5 stars

19. Chuck Versus the Muuurder - Chuck is put in charge of a top-priority mission, but his leadership skills are pushed to the limit when there is a murder in Castle. Meanwhile, Awesome takes on an assignment of his own when Ellie finds a concerning new hobby. Elsewhere, Morgan's managerial leadership is put to the test when his Buy More troops wage war against Large Mart. 3.75 stars (Dale-3.5, David-4)

20. Chuck Versus the Family Volkoff - Sarah throws Chuck a surprising relationship curveball as the CIA orders Vivian Volkoff assassinated. In order to prove Vivian's innocence, Chuck must put his trust in a dangerous ally – her father Alexei Volkoff. Meanwhile, Ellie suspects that her mother is interfering with the search into her father's past. 4 (Dale-3.5, David-4.5)

21. Chuck Versus the Wedding Planner - When Chuck and Sarah get conned out of their wedding money, there is only one man they can turn to for help -- Sarah's conman father, Jack Burton. Meanwhile, Morgan pressures Casey to face Alex's mother, Kathleen. 4.88 stars (Dale-4.75, David-5)

22. Chuck Versus Agent X - Chuck and Sarah put aside spy work to have a weekend of debauchery, but Devon's plans for Chuck's big night don't go quite as expected. Meanwhile, Ellie's investigation into her father's computer leads to a life-changing discovery. 4.38 (Dale-4.25, David-4.5)

23. Chuck Versus the Last Details - Chuck and Sarah's wedding planning includes one final detail: ensuring that the mother-of-the-groom makes it to the ceremony on time and alive. Meanwhile, Morgan's responsibilities as Best Man include his most dangerous mission yet, as he faces Vivian Volkoff. Elsewhere, Ellie tends to the last details of the rehearsal dinner and seeks help from an unlikely source. 5 stars.

24. Chuck Versus the Cliffhanger - Before he can kiss the bride, Chuck must enlist his wedding party to take down Vivian Volkoff and stop her from destroying the big day. When he turns to Alexei Volkoff for help, the CIA sends its toughest agent, Clyde Decker , to stop them. 5 stars.

Disc 4 & 5 - 4.57 stars
Season 4 (Disc 1-5) - 4.53 stars
Collection (Season 1-4): 4.51 stars