Part 1 deals with everything that occurred before the storyline Power And Responsibility which is right before Ben Reilly became the Scarlet Spider...Many events leading up to the original clone saga, the original clone saga, the Gwen Stacy clone, and the return of the clone is highlighted here.

Key:

ASM = Amazing Spider-Man
SPEC = Spectacular Spider-Man
WOS = Web Of Spider-Man
SPID = Spider-Man
SEN = Sensational Spider-Man

1st Appearance of the Green Goblin.

1st Appearance of Harry Osborn, Gwen Stacy, and a Professor by the name of Miles Warren who makes a very brief cameo in the story.

1st Appearance of Norman Osborn and his business associate Mendell Stromm AKA the Robot Master...Stromm seeks revenge at Osborn for taking control of the business after Stromm was ousted and sent to prison for embezzlement...Stromm has a heart attack at the end of the story and is thought to be dead.

Green Goblin and Spider-Man learn each other's identities with that of the Green Goblin's being Norman Osborn, none other than Peter Parker's classmate Harry's father.

1st Appearance of the High Evolutionary whom as we shall see later plays a pretty sizable role in the life of Professor Miles Warren.

Professor Warren has his first non cameo role as he invites Peter to a science exhibit after almost observing Peter placing his Spider-Man mask in his back pocket...They later go to the science exhibit and bring along Gwen Stacy.

Gwen Stacy dies at the hands of the Green Goblin falling from a bridge and The Green Goblin seemingly dies from being impaled by his own Goblin Glider...The death of Gwen Stacy would go on to be the impetus for Professor Warren's hatred of Peter Parker/ Spider-Man.

1st appearance of a  new super-villain for Spidey: The Jackal...Green, furry, and deadly!...He wasnt taken too seriously when he was first introduced but my how things are gonna change!...He later also allies himself with Hammerhead and the Grizzly and still his real identity is a mystery.

Harry Osborn, son of Norman Osborn and the first Green Goblin, takes the mantle of the Green Goblin and becomes Green Goblin II making his father more proud of him...Norman always thought his son Harry to be soft and without a backbone in the past...How can his father be proud of him if he is dead? Good question and it WILL be answered!

Peter meets someone who has an uncanny resemblance to the late Gwen Stacy then battles and defeats Cyclone.

Peter thinks that Gwen is an imposter but later discovers with the help of Ned Leeds that her fingerprints match those of the late Gwen Stacy plus her grave was checked and the body hasn't been touched since she was buried.

Gwen makes a minor appearance as Spidey battles and defeats the Scorpion who makes an unlikely alliance with the Jackal...Spider-Man then battles the Lizard in a swamp with the help of the Man-Thing after a little chat about lost time with Gwen.

While Spider-Man battles the Jackal and Tarantula, Gwen is discovered to be under the control of the Jackal.

Peter finally realizes that Gwen Stacy is a clone while battling the Jackal and Tarantula. He also remembers a time when he and Gwen gave cell samples in one of Professor Warren's classes then goes and visits Warren about the cell samples and finds out they are missing. Warren blames his assistant, Anthony Serba, for taking them. Spider-Man later goes on to defeat Tarantula but is drugged by the Jackal who removes his mask to expose his true identity: Professor Miles Warren!

1st appearance of Spider-Man's clone who turns out to be Ben Reilly. Spider-Man battles the clone in Shea Stadium (which nobody would have noticed that year since the Mets had no attendance!). At the same time, the Jackal proclaims his love for the late Gwen Stacy and it is also discovered that Warren killed his assistant Anthony Serba. In the end, an explosion set by the Jackal killed the Jackal who was later discovered to be a clone of the Jackal. The Spider-Man clone was seemingly dead as a result of the explosion as well.

Spider-Man throws away Dr. Curt Connors conclusions about whether or not he is the clone or the real Spider-Man. He then goes on to battle Spencer Smythe and Spider-Slayer versions of the Kingpin, Vulture and Sandman.

Spider-Man drops the body of the seemingly dead clone in a smokestack within an incinerating plant. Before he drops him in, he calls him his "brother".

Now it gets messy!

A third Green Goblin, Harry Osborn's psychiatrist named Bart Hamilton, re-visits the Brooklyn incinerating plant where Spider-Man disposed of his clone in a smokestack carrying Spider-Man...They are joined by the second Green Goblin, Harry Osborn and Hamilton eventually dies in an explosion.

Spider-Man battles a new foe by the name of Carrion who claims to be the clone of Professor Miles Warren and accuses Spider-Man of the murder of Gwen Stacy. Carrion was eventually killed by a Spider-Amoeba in the end.

Mendell Stromm appears to be back alive battling Spider-Man but "he" turns out to be a robot programmed with Stromm's brain waves after he supposedly died.

The Gwen Stacy clone re-surfaces in Lansing Michigan  where she is a teacher at Baxter High School. The High Evolutionary is looking for her...She makes it to Columbus Ohio where the High Evolutionary's Gatherers almost track her down. She is now going to find Peter for help.

The High Evolutionary's Gatherers battle Spider-Man as the Gwen clone tries and does again meet Peter. It is learned that the High Evolutionary wants to study Gwen and later captures her after she discovers that Peter is Spider-Man. The High Evolutionary concludes that she is not a clone but rather a genetic construct. Daydreamer of the Young Gods later clears her mind of the "illusion" of being a clone of Gwen Stacy.

Spider-Man meets a new Carrion who is a student named Malcolm McBride who stumbled upon the abandoned lab of Professor Miles Warren and found a vial of the Carrion virus that infected him. Peter also came upon the same lab and found a journal from Warren he left behind. In it Warren stated how he learned Peter was Spider-Man and that his assistant Anthony Serba was the Spider-Man clone and Joyce Delaney was the Gwen Stacy clone. Both as a result of Cellular transformation and are genetic constructs. The first Carrion was discovered to be a genetic virus infection and NOT the clone of Professor miles Warren. 

A man by the name of Ben Reilly is seen in Salt Lake Utah along with another man by the name of Kaine. They will both later be discovered to be clones of Peter Parker. 1st appearance of Louise Kennedy who falls in love with Kaine and is also the partner of a Detective named Jacob Raven...Ben eventually saves Raven's life from organized crime figures who took the life of his wife. Ben meets Kaine and fights as Kaine's cellular degeneration accelerates...Kennedy later is discovered to be playing both sides of the law and Kaine murders her. 

Note: Spider-Man: Lost Years #0 (1/96) was a reprint package of the backup stories in WOS #117, ASM #394, SPID #51, SPEC #217, ASM #400, SPID #57 & SPEC #223.

Harry Osborn, the son of Norman Osborn and the second Green Goblin, dies as a result of the new Goblin formula that turned out to be too toxic for him to handle.

Aunt May receives a mysterious phone call who senses that there is trouble in the Parker family & according to Aunt May it "seems been ages since we last chatted".

Aunt May has a stroke and is found on the kitchen floor by Mary Jane.

The mysterious figure calls Parker residence and Mary Jane answers and hangs up. The clone recognizes Mary Jane's voice.

The mysterious caller calls the Parker residence as an "old friend" of the family trying to reach May Parker. When told that she was in a hospital, the man crushes the phone wearing a recognizable school ring then races to his motorcycle.

The mystery man gets closer and closer to the east coast from the west coast to see Aunt May and the school ring is getting larger and larger becoming more visible.

The mystery man saves a small child from being hit by a truck in the middle of the street.

Mystery man goes to visit Aunt May in the hospital but leaves suddenly after seeing Peter Parker arrive. He then calls the hospital for her condition from a pay phone.

The mystery man visits the grave of Gwen Stacy then Midtown High School now fully displaying his ring of the same school. A guard questions why he is there at such a late hour.

The mystery man snoops around Aunt Mays home and Spider-Man scares him away thinking he was a burglar.

Mystery man goes to see Aunt May in the hospital but once again sees Peter Parker & again leaves. He eventually sees her later.  Last page shocker shows Peter Parker coming face to face with the mystery man himself: Another Peter Parker!

Power And Responsibility

After the clone and Peter Parker battle it out, the clone tells Peter who he is and a key player is introduced in the form of Judas Traveller and his host, a man who studies human nature and their capacity for good and evil...Another mysterious figure is introduced who doesn't play much a a role at this point by the name of Scrier, but in the end he (or it) will! Traveller discovers the clone and sends his associate Chakra to bring him to Ravencroft Asylum to try and save Spider-Man where he also is...Chakra retrieves Ben Reilly (as he first called himself) from the hospital where Aunt May is and he first dresses up in the Spider-Man costume and then meets Peter at Ravencroft...They eventually fight each other again then team-up against the inmates of Ravencroft where they create a tight bond and alliance. The clone vanishes away after an explosion then ponders whether he should stay or return to exile.

Birth Of A Spider-Man (Backup story)

Professor Miles warren creates a clone from a chemical tank while blaming Peter Parker for the death of Gwen Stacy. He uses mind-controlling drugs and hypno-therapy on the clone but eventually the clone breaks free...As the clone discovers his powers, he meets the Jackal and fights him then meets the Gwen Stacy clone and the Jackal knocks him out...Clone first puts on Spider-Man costume while Warren forms the clone's sense of identity...Amazing Spider-Man #149 is covered in more detail and shows the clone leaving the incinerating plant where Peter left him and set off to Parker's apartment where he saw Peter and Mary Jane which made him realize that he was the clone.