Aussie Robert Scorpio arrived in Port Charles in 1981. He was following Luke Spencer, hoping to locate the whereabouts of a rare and elusive diamond called the Ice Princess. He believed Luke knew where it was and was hiding it somewhere. Luke denied its whereabouts. Robert was posing as a playboy financier who wanted the diamond for financial reasons. The two men butted heads until finally Robert revealed to Luke and his fiancée, Laura Webber that he was actually a WSB agent, working undercover to find the Ice Princess and retrieve it before it got into the hands of the Cassadine family. Luke agreed to help him get it back and fight the Cassadines before they tried to take over the world using this diamond to do it.

Robert and Luke became best friends and Robert stood up as Luke's best man at his wedding. Eventually, Robert resigned from the WSB and became the new police commissioner of Port Charles. Robert had brief relationships with Tiffany Hill and Jackie Templeton. Tragedy soon struck home when Luke's wife Laura was presumed to have drowned in the Port Charles River one night and died. Luke later found comfort and intimacy with a beautiful British woman named Holly Sutton. Another bizarre twist of fate happened later when Luke was caught in the middle of an avalanche and presumed dead. Holly learned she was pregnant with Luke's child and was about to be deported to England. Robert stepped in and agreed to marry her so she could stay in the United States and have a father for her child. Robert and Holly soon fell in love after Holly miscarried and needed comfort and understanding from Robert. Luke returned home months later alive and well. He became angry with Robert after learning he married Holly. The two men became estranged and butted heads again. Later they patched up their differences.

Two people from Robert's past returned to his life. Robert's former boss and friend at the WSB, Sean Donely came to town after hiding Luke in Mexico and ended up being involved in some corrupt business that ruined their friendship. Robert's ex-wife Anna also came to town and nearly ruined his marriage to Holly, who was unaware he was married before. Anna had been a double agent when married to Robert when they were fellow WSB agents. Later, Robert learned that Anna had another secret she had kept from him all these years, she had given birth to a daughter named Robin after their divorce and he was the father. Robert bonded with 6-year old Robin when she lived with him for awhile for protection from kidnappers. Robert patched up some of his differences with Anna for Robin's sake as well as with Sean Donely who saved his life once again.

He moved with Holly to Australia. A year later he returned to investigate who was targeting Anna for assassination. He eventually returned to live in Port Charles more permanently after Holly was presumed dead after a plane crash in Australia. Robert started working as a private investigator but eventually took his old job back as police commissioner. He started dating other women like Cheryl Stansbury, his friend Tiffany's sister, and pianist Katherine Delafield. His good friend Bobbie asked him to be her adopted son Lucas's godfather and he agreed. He was briefly engaged to Katherine Delafield but the engagement was broken off. Soon after Robert was surprised when his ex-girlfriend Cheryl told him he was the father of her baby, who ended up being Bobbie's adopted son Lucas, his godson. Robert had a paternity test done which revealed he wasn't Lucas's biological father. Robert's ex-wife Anna started to stir up old bitter feelings about their divorce years ago when Robert was unable to forgive his friends for their faults. He explored those feelings with her again and realized he still loved her.

Robert's long-lost younger brother Mac showed up on a ship into Port Charles. It was revealed that Robert blamed Mac for the death of their parents as a result of a plane crash because Mac was piloting the plane and Robert believed he was careless and accused him of leaving him there to die so he could run away. Several attempts on Robert's life started happening and Robert almost died because of an explosive device thrown into his office. Robert recovered and eventually went after Mac. Mac saved Robert's life by killing a hit-man who shot at Robert. Robert and Mac resolved their differences again.

Robert remarried Anna and bought a house for them to live in with their daughter Robin, now in her teenage years. Anna's old boss at the DVX, Cesar Faison resurfaced again and continued his obsession of Anna. He orchestrated a complex plot to kidnap Anna. Robin managed to avoid being kidnapped. Robert also got another shock of his life when his presumed dead wife, Holly came face to face with him at a party in New York City. Robert found out that Holly never got on that plane and ended up back in England helping her corrupt family. Robert left Robin in the care of his brother Mac and his friends while he went in search of Anna to bring her back home. Later, the WSB informed everyone that Robert, Anna, and Faison were killed in a boat explosion in South America. Faison shocked everyone years later by showing up in Port Charles and wreaking havoc on everyone including Mac.

Over a decade later it was revealed that Anna Scorpio was alive and she reunited with her daughter Robin and brother-in-law Mac. She told them that Robert was dead even though no body was recovered.

In 2006, Robert was revealed to be alive, having been forced back into service by the WSB in exchange for the life of his wife Anna. Eleven years after the explosion, a change in the WSB administration allowed Robert to finally leave the bureau. He began working with the Medical Rescue Agency as a Containment Specialist. His work brought him to the Markham Islands where he learned his best friend Luke Spencer had come in contact with a deadly strain of encephalitis. Robert followed Luke back to Port Charles, where he found that the virus had already begun spreading through the city. As he was searching through files at General Hospital, Robert came face-to-face with his daughter Robin who was devastated to learn that her father had faked his death, essentially abandoning Robin and her mother Anna. Although Robert tried to explain, Robin was too angry to listen and the virus was spreading fast. Robert did his best to contain the virus, eventually ordering a quarantine of the hospital. While there, his brother Mac, the Police Commissioner, also learned he was alive and Robert had another family confrontation. In the end, the Scorpios put aside their hostilities temporarily to work to contain the virus.

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