Callum Rebecchi (also Jones) is a fictional character from the Australian soap opera Neighbours played by actor Morgan Baker. He made his first screen appearance during the episode broadcast on 9 June 2008. The character was introduced to the show following the decision to stop a storyline that saw Toadfish Rebecchi adopt a child from Indonesia. Baker began filming his first scenes in March. Callum departed Neighbours on 12 June 2014, following Baker's decision to concentrate on his schooling. Baker reprised the role for a cameo appearance on 17 September 2015. He has made subsequent guest appearances from 7 June until 12 June 2017 and again from 20 February until 13 March 2019. In 2022 it was announced that Baker would once again reprise the role as part of the series finale.

Callum was initially portrayed as a tearaway, who created chaos to be noticed. He is also smart, funny and cunning. Callum has had to grow up quickly and he has become "very emotionally mature". In a major storyline for the character, it was revealed that Toadie's partner, Sonya Mitchell (Eve Morey), was Callum's biological mother. Other storylines have seen Callum develop a romantic relationship with Rani Kapoor (Coco Cherian), befriending Bailey Turner (Calen Mackenzie) and dating Josie Lamb (Madison Daniel). Callum has received a mixed reaction from critics of the serial. Some praised him for his honesty, while others said he is too "brattish".

Creation and casting The character of Callum was introduced to Neighbours after producers decided to stop a storyline which saw Toadie (Ryan Moloney) try to adopt an Indonesian child illegally. In 2008, viewers saw Toadie trying to adopt an East Timorese orphan, after claiming that he had lived in Indonesia for 12 months. Producers decided to stop the storyline at the last minute and Toadie met Callum instead. Of the storyline Moloney said "I thought was just ridiculous. And it was just to spite Steph! I was like, 'What are we doing?'" Moloney said that having the character of Callum around is "really cool".

Baker was cast in the role of Callum and he began filming his first scenes in March 2008. The actor was 10 years old when he joined the show. Baker's filming schedule meant that occasionally he could not attend school and he had to be tutored in a classroom at the Network Ten studios. Prior to his departure in 2014, Baker was one of the longest-serving out of the show's younger cast.

Development Characterisation Callum was initially a tearaway who stole from his neighbours and tried to stay home from school. The official Neighbours website said Callum is someone who creates chaos to be noticed. He is energetic, lively and a bit of larrikin, but under the surface he is just looking for someone to love him. The website described Callum as "smart, sharp, funny, cunning and clever." A writer for Inside Soap said Callum is a cheeky lad, who is more interested in pizza and comic books than his school work. Executive producer Susan Bower called Callum Toadie's "Mini Me." Both Toadie and Callum are fans of professional wrestling and their wrestling egos are called The Lawman and Babyface. In March 2009, professional wrestler Dave Batista made a guest appearance in Neighbours and he filmed a few scenes alongside Toadie and Callum. Following a Rebecchi family tradition, Callum was given his own aquatic nickname – Squid.

In April 2013, Baker's co-star Eve Morey explained that Callum would start to rebel against his parents in future storylines and revealed her surprise at how well adjusted Callum is. She said "I can tell you it's starting. And it's actually really good, because we're doing a few storylines now, where he's starting to explore that darker side of being a teenager. And I think that's really good for him." Morey added that Callum had to grow up quickly and be "very emotionally mature", so she was not surprised that his pent up anger begins to appear.

High school and career plans In October 2009, Baker began shooting scenes of Callum's first week at high school. Callum finds it difficult to settle in at his new school and he finds himself "torn between his friends from Ramsay St and his new friends". Baker said "He has quite a hard time". Viewers have not seen Callum go to school before as there is not a primary school set at the Nunawading studios, where Neighbours is filmed. However, once the character joined Erinsborough High, he began to appear on the show more often and started interacting with other children his own age.

In July 2010, Callum decides that he wants to become a stand up comic, but Toadie is not happy with Callum's plans. Callum watches some gross out comedies and they inspire him to take up Comedy as his future career. Of his character's career decision, Baker said "Callum is starting to grow up and thinks he'd be quite good at being a comic". Callum is determined to "get his own way" and he discovers an open mic event for new comic performers. He sneaks into the venue and gets onto the stage. Baker told Inside Soap that Callum "soon gets sprung" as Lucas Fitzgerald (Scott Major) and Michael Williams (Sandy Winton) are also at the event. For the storyline Australian comedian, Lehmo, filmed a guest role with the show, which saw Callum upstage him.

Mother In January 2011, it was revealed that Sonya Mitchell (Morey) is Callum's biological mother. Sonya's sister, Jade (Gemma Pranita) is shocked when she discovers that Sonya is keeping the truth from both Callum and Toadie. Morey said that since Sonya arrived, there has not been any indication that she is Callum's mother. Both Morey and Moloney thought that the storyline could be possible and Morey chose to research how other people had reacted to similar situations. Morey told the show's official website that Sonya entered Callum's life, not to get him back, but to see if he was okay. When TV Week asked how it is possible that Callum would not remember his mother, Morey explained "We did have to look at that, but he's never known much about his mother. His great-grandmother raised him and never gave him much information since she was so disappointed in Sonya, who had Callum at 16. I also think Callum's blocked out any image he had of her, who he hasn't seen for many years." Morey said Sonya had become addicted to alcohol and drugs, when she had Callum and she chose to leave him, so she could get herself cleaned up.

Morey stated that Sonya did not feel like she deserved to be Callum's mother because she hated the person she used to be. She thinks that it is better if Callum knows her like she is now. Executive producer Susan Bower defended the storyline when she was asked why the writers had rewritten Sonya and Callum's history. She told Inside Soap that they worked with the character's established backgrounds and found reasons and motivations for Sonya to act the way she did. However, she added that the only discrepancy that could be pointed out was Callum's age. When Callum's great-grandmother dies, Sonya becomes concerned that her secret will be revealed because Callum wants to attend the funeral. However, Callum chooses not to attend the funeral as he wants to say goodbye to his great-grandmother privately. Callum later explains to Sonya that he wants to find his mother and tell her that he hates her. Morey revealed that the truth about Sonya was going to be exposed in April 2011. Callum steps up his investigation into the identity of his mother and he is injured in an accident and rushed to hospital, where he recalls a memory about his mother and realises that she is Sonya.

Relationships Rani Kapoor On 13 May 2012, Susan Hill of the Daily Star reported Callum would develop his first crush on his classmate, Rani Kapoor (Coco Cherian). Hill stated that Callum would be "heading for one of the most embarrassing times of his life" when Toadie and Sonya find out about it. Callum tells Toadie about his crush and he receives some "man-to-man" advice from him. However, Toadie then tells Sonya, who tries to help Callum by hiring Rani to work at her nursery alongside him. A show spokesperson told Hill "Callum's cringing and embarrassed and doesn't know how he's going to get through each day working with Rani. And Callum is not at all happy about Toadie spilling the beans." Callum continues to carry "a torch" for Rani and spends months trying to "pluck up courage" to tell her how he feels about her. However, he is heartbroken when he catches her kissing Harley Canning (Justin Holborow) and learns that they are dating. Cherian commented "Rani's a little bit blind to the fact that Callum likes her so much. She hasn't picked up on anything." Instead of giving up on Rani, Callum decides to turn himself into "a bit of a bad boy like Harley" to get her to notice him. Hill reported that Rani is not sure what has got into Callum and commented "Whether or not Callum's tactic works remains to be seen."

When Bailey Turner (Calen Mackenzie) moves into Ramsay Street, Callum immediately warns him off pursuing Rani. Mackenzie commented that while it was hard for Bailey to back off, as he really liked Rani, he did not want to break the code by stealing her away from Callum. Rani becomes torn between the two boys and eventually shares a kiss with Bailey while they are rehearsing for a school play. Callum is "devastated" when he finds out what happened and asks Rani to end her friendship with Bailey, which she does. Following his ultimatum, Callum "tries desperately" to ignore the tension between Rani and Bailey. However, it gets too much for him when he sees Rani and Bailey talking by the pool and he begins a fight with Bailey. Callum pushes Bailey, who hits his head, loses consciousness and falls into the pool. Rani manages to snap Callum into action and he jumps in and pulls Bailey out.

Imogen Willis In August 2013, Hill reported that Callum would develop "a huge crush" on his older neighbour Imogen Willis (Ariel Kaplan), but would likely get his heart broken again. Callum goes as far as to tell his parents that he has a girlfriend, even though Imogen is not aware of his feelings for her. However, things get bad for Callum when Bailey tells Imogen, as he worries about Callum getting hurt. A spokesperson stated "Imogen is due to attend a dinner where Callum will be present. He can't wait for the big night as he's planning to confess how he feels. But Imogen then decides she can't be at the dinner as she doesn't want to face Callum."

Josie Lamb Callum later befriends Josie Lamb (Madison Daniel). Josie develops her own crush on Callum, but when she learns that he likes Imogen, Josie decides to try and change herself to be more like Imogen. Josie begins exercising hard to impress Callum and she later signs up for the local fun run. During the race, Josie goes to see Callum and Bailey at the drinks stand, but when they ignore her, she decides to keep running without getting herself a drink. A combination of dehydration, not eating and her vigorous exercise routine cause Josie to collapse and she is taken to hospital. Callum feels guilty and blames himself. He later realises that he does have feelings for Josie and asks her to the school dance. Daniel commented "Callum doesn't take much notice of Josie until she's in hospital, so she thinks he's only invited her to the dance out of pity."