Sabotaged Steffy Forrester's tribute video to Brooke Logan to expose Brooke's "mask-boink" with Oliver Jones 
Kissed Malaika Maponya while married to Donna Logan 
Aided Bill Spencer in his attempt to dupe his ex-wife Katie Logan into signing over control of Spencer Publications 
Dumped Ridge Forrester out of a helicopter and into the Persian Gulf on Bill Spencer's orders 
Justin Barber is the son of Wesley Barber and Valerie Lowell, and is related to the Barbers of Genoa City, Wisconsin. An executive at Spencer Publications, Bill Spencer, Jr. brought Justin out from New York to work alongside him in Spencer's home office in Los Angeles. Justin's main assignment was to aid in Bill's takeover of design house Forrester Creations.
Justin ran into Donna Logan, whom he'd dated in high school, and wanted to know why Donna had suddenly broken things off and moved to Europe. When Justin saw Marcus Walton with Donna, Justin did research and discovered that Donna had just reconnected with Marcus, the son she'd given up for adoption. Justin confirmed Marcus was his and got to know him, even though Marcus had been legally adopted by Donna's husband, Eric Forrester. Justin cast Donna as the co-host of Bill's fashion talk show, The Catwalk; when Donna divorced Eric, Justin was instrumental in convincing Donna to ask for half of Eric's 25% share in Forrester, which Donna then sold to Bill.
Justin got his hands on a video tribute being made for Donna's sister, Forrester executive Brooke Logan, and a recording exposing how Brooke mistakenly slept with her daughter's boyfriend. Justin added the audio and leaked the video to the world in hopes of aiding Bill's crusade against Forrester, but Justin barely kept his job after Bill objected to his actions because Brooke was also the sister of Bill's wife, Katie Logan.
Justin romanced Donna, marrying her with Justin's Genoa City cousin, Olivia Barber Winters, in attendance; Justin hoped Marcus would take his last name as well. Justin inexplicably kissed Malaika Maponya, a doctor he'd known in South Africa, and was distant when Donna almost caught them. Months later, Justin and Donna realized they'd only gotten married so Marcus could have his parents together, and amicably divorced.
Justin continued aiding Bill in his schemes against Hope Logan, whom Bill didn't think was good enough for his son, Liam Spencer; Justin leaked news of Steffy's engagement to Liam so Hope would see it and helped spring Hope's father, Deacon Sharpe, from jail to prevent Hope's own wedding to Liam. Justin was nearly discovered when he accidentally "pocket dialed"¯ Marcus, who overheard Justin and Bill discussing their plots. Justin dug up dirt on the wrongly convicted Maya Avant to keep her away from Rick Forrester, who was dating Bill's niece, Caroline Spencer. Then, after Katie divorced Bill for having an affair with Brooke, Justin approved Katie's request for 1% of Spencer Publications, inadvertently allowing Katie to become CEO after Katie made Bill's sister, Karen Spencer, the majority stockholder. Justin presented Katie with papers that would return control to Bill, which Bill seduced Katie into signing; Justin was shocked when Brooke replaced the papers with a pile of leaves.
Justin uncovered photos of Brooke's longtime love, Ridge Forrester, at a gay pride parade to help Bill keep Brooke from reuniting with Ridge. Justin accompanied Bill to Abu Dhabi, where Bill was set to marry Brooke until Ridge showed up to stop the ceremony; on Bill's orders, Justin banked the helicopter Ridge had dragged Brooke onto, plunging Ridge into the Persian Gulf. Justin was relieved when Ridge turned up alive with no memory of the event. Tasked with flying Bill and Brooke to a second wedding on Catalina Island, Justin was punched by Ridge, who remembered Abu Dhabi and took over Justin's helicopter. Justin was grateful Ridge chose not to press charges.
Justin ran an exposé on the transgender Maya to help Bill oust her boyfriend, Rick Forrester, who had become the tyrannical CEO of Forrester Creations. Later, when both Liam and his nemesis, Quinn Fuller, went missing, Justin located Quinn's ex-husband, Deacon, and pumped him for information about Quinn. After Liam returned reporting he'd been held by Quinn while suffering from amnesia, Justin advised Liam to drop the case as Liam and Quinn had lived as man and wife, which would make it very difficult to make any charges stick. Justin also helped arrange a settlement in Bill's second divorce from Katie which included a jet.