Introduction Bianca's casting in an unnamed guest role was announced via a press release issued by
Amazon MGM Studios in the United States. The character was announced in advance spoilers and it was revealed she would be introduced as the sister of established character
Cara Varga-Murphy (
Sara West) who gives her "an unexpected visit". The show officially announced the casting and character details on 14 January 2024. Chelsea is named after the
Neighbours crew member Chelsea Chua. Bianca revealed that the part of Chelsea is an extended guest role. In a backstage video, she stated "Chelsea sticks around for a while and has quite a bit of business to tend to, and is determined to do so." Bianca described Chelsea as "a really effective manipulator" and has ulterior motives behind her actions. Bianca added that Chelsea has "always got something else kind of ticking." Bianca revealed that Chelsea would create "major trouble for other people but then in turn herself and she then needs to cover her tracks. And we see lies upon lies and she's burying herself in a hole. And in doing so she becomes quite vulnerable I think and it all becomes very messy for Chelsea." Writers portrayed Cara as delighted to have Chelsea around, but Cara's wife
Remi Varga-Murphy (
Naomi Rukavina) is annoyed by Chelsea's presence but Cara is defensive over her behaviour. Remi becomes concerned that Chelsea offers relationship advice to her teenage son,
JJ Varga-Murphy (Riley Bryant), after he shows interest in the older
Sadie Rodwell (Emerald Chan). Chelsea also befriends Cara and Remi's new friends
David Tanaka (
Takaya Honda) and
Aaron Brennan (Matt Wilson). Chelsea decides to give herself a make-over inspired by Terese's style to gain Paul's attention. Her plan begins to work as Paul takes notice of her. Writers developed the rivalry between Chelsea and Paul's ex-wife, Terese, which ends in a confrontation. Chelsea takes revenge by sabotaging a memorial plaque dedicated to Terese's dead son,
Josh Willis (
Harley Bonner). Chelsea conceals the plaque in rubbish and ensures it is disposed of. Bianca told a
TV Week reporter that Chelsea is "triggered" by Paul and Terese's bond. Chelsea realises that Paul and Terese's common experience of losing a child threatens her schemes. Bianca explained that Chelsea is "worried" that she will lose Paul to Terese. She also views Terese as "a successful older woman who has built a robust business for herself – exactly what Chelsea aspires to." Elmaloglou told the radio host that "Paul's got Chelsea and yeah, I think you know, we all love a bit of drama, and we expect it when we work on a show like Neighbours." He is doing a "juggling act" trying to figure out how to be with both Chelsea and Terese. Elmaloglou added that Terese initially lets Paul spend time with Chelsea instead of being overly reliant on him. Chelsea decides to enact her plan after realising that Paul values family in his will. She faces difficulties in her attempts to become pregnant after Paul dismisses the seriousness of their relationship. Chelsea also continues to manage Lassiters, and repeatedly tries to undermine her rival, Krista. A
TV Week reporter revealed that Chelsea's jealousy over Paul heaping praise on Krista leads her to make a drastic move, which leaves both Krista and her unborn baby in danger. Chelsea locks Krista in a sauna so she can take her place in a work presentation, leading Krista to collapse and lose her unborn baby. Writers explored Chelsea and Krista's rivalry over the following episodes. Bianca told Sarah Ellis from
Inside Soap that "Chelsea feels threatened by Krista's power." Chelsea envisions herself and Paul as a "power couple" and wants to "shine at Lassiters" to achieve her this. Bianca noted that "Krista already possesses what Chelsea so desperately wants" and she is "envious" of her. She defended her character's behaviour, noting "Chelsea is riddled with guilt" about Krista's miscarriage and it was unintentional that the situation becomes so "awry". Bianca worried that her character's schemes were out of control in this plot and hoped for a redemption story arc. She hoped that Chelsea would achieve her goals of snaring Paul's livelihood and become the "power couple". Jeffrey's report directly implicates Chelsea in the incident. Chelsea becomes determined to convince Jeffrey to doctor his report and makes him an "indecent proposal" in exchange. Michael Adams from
Metro reported that Chelsea is "left embarrassed" because it is "evident" that Jeffrey has "fallen for her".
Departure Chelsea's lies unravelled amidst her engagement to Paul. Kilkelly (Digital Spy) reported that "their relationship finally takes a more serious turn", as Paul asks Chelsea to propose to him and he accepts. Paul's son
Leo Tanaka (
Tim Kano) suspects that Paul is using Chelsea to get over Terese. A
Neighbours publicist told ''Inside Soap's'' Chloe Timms that Chelsea feels accomplished and has got everything she "worked so hard for - and she's relishing every second". The publicist added that "Krista now knows every horrifying thing Chelsea has done in Erinsborough." In a backstage video, Bianca revealed that Chelsea and Paul's engagement party took one day to film. She added that it began "on a high" but ends "tragically, especially for Chelsea." In the aftermath of the reveal, Paul is "thrown into turmoil as he finally realises what Chelsea is capable of." Bianca wrote a post on her
Instagram account revealing that her guest stint on the show had ended, stating "thank you for welcoming me into the
Neighbours family. I'm so grateful for the opportunity." Bianca added that working on Chelsea's final episode created "a melting pot of feels". Digital Spy's Kilkelly revealed that Cara briefly notices Chelsea but dismisses what she has seen. He confirmed that Chelsea is back in Melbourne and is pregnant. Her return occurred during the episode broadcast on 18 December 2024, which was the show's 2024 finale episode and served as a cliffhanger storyline.
Neighbours social media accounts also confirmed that Chelsea would return to the show for an "extended stay" in 2025. On 1 January 2025,
Neighbours executive producer
Jason Herbison revealed more details about Chelsea's return in an interview with Johnathon Hughes from
Radio Times. He stated "she's been at large for almost nine months and there are reasons why she hasn't come forward with her pregnancy sooner. All I can say is – expect the unexpected!" The airport scenes are due to be revisited through flashback on 6 February, revealing that Cara spoke to Chelsea and refused to support her.Writers continued to explore Chelsea's return storyline with the introduction of her cousin,
Maddy Murphy (Emma Horn). Cara decides to track Chelsea down but struggles to find her. She decides to ask Maddy for help, who initially claims to be unaware of Chelsea's whereabouts. It is later revealed that Maddy helped Chelsea give birth but she moved on soon after. The story explores Chelsea's arrival and meeting with Paul and Terese on Ramsay Street, where she introduces him to Thomas. A paternity mystery story ensues as Paul and Jeffrey participate in a DNA test to determine Thomas' paternity. Jeffrey agrees to be supportive if proven as the father, but is less involved in the story than Paul. Paul is portrayed as being more attentive to Thomas and hopes to be his father. It was also revealed ahead of transmission that Paul is Thomas' biological father. Of Chelsea's return, Bianca acknowledged that Chelsea left the series as a "disgraced" character. She revealed that "has gone through a lot" during her absence and returns "very humbled and with child". Bianca hoped that it was a chance for Chelsea to "redeem herself". She described filming with Lyons on-set as a "really special" experience. Bianca was unsure if Chelsea still loves Paul, explaining that "I can't say with total conviction that the flame is entirely out in regards to her feelings for Paul." Bianca revealed that playing a villain can be difficult because viewers perceive actors to behave like their characters. She added "I was really grateful to the fans that acknowledged that and the people who hated Chelsea meant we were succeeding at what we were doing." ==Storylines==