Title: List of Ghost Whisperer characters
Content:  Jim, says "Do I know you?" This leads Melinda to try to prove to him who he really is, especially when pieces of Jim's memory start to show. At first, he thinks she's crazy and doesn't believe her. When Melinda is trapped underground, Jim goes to save her, but he starts to drown and he has flashes of memories as Jim, thus bringing Jim fully back. When he finds Melinda, she calls him Sam to which Jim replies "Why are you calling me Sam?" Melinda then realizes Jim is back and she happily hugs him. Later on, Melinda finds out she is pregnant again and it 
Title: List of Ghost Whisperer characters
Content:  go into the light, promising she'll be there one day. But when Jim and Melinda witness paramedics trying to revive a motorcycle accident victim named Sam Lucas (Kenneth Mitchell), they see the ghost of the victim go into the light. Jim goes over to the body and tells Melinda it's the only way. Before Melinda can stop him, Jim's ghost enters Sam's body, thus bringing him back to "life." However, the viewers continue to see him as Jim while everyone else in the show including Melinda sees him as Sam. When Melinda says "You're back", Jim, who now believes he is Sam and has no memory 
Title: Ghost (musical)
Content:  Molly tells him that she'd still like to hear it every now and again, but his reply reassures her nonetheless. However, they're soon approached by an armed man that tries to steal Sam's wallet. Sam fights back instead of surrendering, and the two struggle for the gun. It goes off and Sam is fatally shot, leaving Molly to cry out for help ("Sam's Murder"). Instead of moving on, however, Sam becomes a ghost, and he stays behind with Molly instead of following the light; unable to leave Molly, he follows her to the hospital, and another ghost explains what he's become ("Ball of Wax"). A trapped Sam struggles to reach out 
Title: Ghost Whisperer (season 4)
Content:  In the fourth season, Melinda meets Eli James (Jamie Kennedy) after a fire at Rockland University who, after his own near-death experience, develops the ability to hear ghosts. Melinda says goodbye to her close friend Rick Payne, who leaves Grandview on a research trip for the university. In this season, Jim is shot and killed. He does not "cross over" because he does not want to leave Melinda, and his spirit later enters the body of a man named Sam Lucas, who died in an unrelated accident in Grandview and crossed over. When Jim/Sam regains consciousness, he has no memory of being Jim. Melinda works to get him to remember his past life and her, and succeeds after much difficulty and skepticism on the part 
Title: Ghost (1990 film)
Content:  Sam Wheat, a banker, and his girlfriend Molly Jensen, an artist, renovate and move into an apartment in Manhattan with the help of Sam's friend and co-worker Carl Bruner. One afternoon, Sam confides in Carl his discovery of unusually high balances in obscure bank accounts. He decides to investigate the matter himself, declining Carl's offer of assistance. That night, Sam and Molly are attacked by a mugger who shoots and kills Sam in a scuffle before stealing his wallet. Sam sees Molly crying over his body and discovers he is now a ghost, invisible and seemingly unable to interact with the 
Title: Ghost (1990 film)
Content:  is shocked to discover her true psychic gift when she can hear Sam speaking. Sam persuades her to warn Molly that she is in danger. To allay Molly's skepticism, Oda Mae relays information that only Sam could know. Molly later gives Willie's address to Carl, who volunteers to investigate. She then goes to the police, who have no file for Willie but they show her Oda Mae's lengthy one as a forger and con artist. Meanwhile, Sam follows Carl and is devastated to learn he and Willie are working together. Carl is laundering money for drug dealers and had Willie rob 
Title: Melinda Gordon
Content:  to Jim "You have to do the right thing." He replies "I know." and possesses the body of a dead man, Sam, to live again in episode 4.07 "Threshold". Melinda happily says to Jim "You're back" to which Jim/Sam replies "Do I know you?" Melinda begins dating Jim/Sam when Sam's ex-girlfriend Nikki leaves Grandview. Melinda revealed her gift to Jim/Sam and his response was unexpected. Melinda told Jim/Sam he is really Jim and Jim/Sam tells Melinda that he thinks she needs help. Melinda finally gives up and painfully tells him to leave, thinking that no matter how hard she tries, Jim will never be back. But 
Title: Walled In
Content:  his father was one of the victims, the crime being blamed on a local factory worker. The lights go out, and Sam cuts her leg after panicking in the darkness. Later, Jimmy washes her wound and begins to caress her thigh, but she tells him to stop. Sam begins having nightmares about being entombed in the walls. Sam's boyfriend arrives, causing Jimmy to grow jealous. While exploring the eighth floor, Sam and her boyfriend discover a secret passage which would allow someone to secretly view any of the apartments. Sam realizes that Jimmy has been spying on her. Later, as Sam and 
Title: Ghost (musical)
Content:  with several accounts and is unwilling to let them go, despite the fact that he has a date with Molly that evening ("More"). He confides in Carl with his discovery, and his friend not only agrees to keep the findings a secret, but promises to investigate himself, so Sam can keep his date. Thanking him, Sam leaves, and meets up with Molly, who later confesses that she wants to marry him. Sam is taken aback and Molly suddenly asks why he never tells her that he loves her ("Three Little Words"); he assures Molly that he doesn't say it in so many words because he prefers to say it through his 
Title: List of Ghost Whisperer characters
Content:  Relieved to hear his surgery went well, Melinda is taken to his room and asks if she may stay with him until he awakens. It is implied she waits several hours, and she eventually falls asleep next to him. She wakes up to find Jim next to her, and believing him to be awake, she tells him she loves him. When Jim tells her softly he suffered an embolism, Melinda tries to get a doctor but Jim tells her not to and says that he wants her to remember him as he is now. This causes Melinda to realize Jim is appearing to her as a 

Question: when does sam realize he is jim in ghost whisperer?
Answer: Leap of Faith.