ARESE, Italy—Fiat Chrysler Automobiles NV on Wednesday unveiled an Alfa Romeo sedan that it billed as the start of the renaissance of the storied sports car brand and a key part of its plan to lift sales by 50% by 2018.

The luxury sedan is the first vehicle from a €5 billion ($5.6 billion) Alfa investment plan that aims to leverage the brand's racing history to take on Audi, BMW and Mercedes-Benz.

Called Giulia, the rear-wheel-drive Alfa Romeo is due to go on sale sometime next year. Pricing wasn't disclosed.

Chief Executive Sergio Marchionne described the project as a deeply personal endeavor. "It is no mystery that Alfa is one of the projects that I have been most involved in, both operationally and emotionally," said Mr. Marchionne. "It is one of the most important of my career."

Wednesday's unveiling, on the 105th anniversary of the Alfa Romeo brand, came with pomp and circumstance that included a surprise appearance by Italian tenor Andrea Bocelli, who sang an aria from Giacomo Puccini's Turandot.

To achieve his goals for Alfa, Mr. Marchionne, who saved Fiat from falling into bankruptcy and led Chrysler out of a similar fate, must pull off one of the Houdini acts he has become famous for.

The Fiat Chrysler merger made it possible to have the financial resources, technical capability and global distribution needed to relaunch Alfa, Mr. Marchionne said. The combined company projects global sales this year of between 4.8 million and 5 million vehicles.

The ambitious five-year sales forecasts have drawn skepticism from analysts and industry insiders. Mr. Marchionne has already missed his sales targets on Alfa several times. The CEO had a previous plan that called for 500,000 in vehicle sales in 2014, but the company actually sold about 70,000. Sales have fallen almost uninterruptedly for 15 years from a high of more than 200,000 in 2001.

Mr. Marchionne must also return Alfa to profitability. Though Fiat Chrysler doesn't break out the profitability figures for its individual brands, many analysts reckon Alfa has been accumulating losses for at least a decade.

Alfa Romeo brand chief Harald Wester, also Fiat Chrysler's chief technology officer, is moving Alfa upmarket, which took competitors decades to achieve.

"Audi took 30 years to become a premium brand, but it has to do with where they were before," Mr. Wester said in an interview earlier this year. "Alfa has a historic legacy that it can leverage."

Mr. Wester—who spent time previously at Volkswagen, Audi and Ferrari—has been working with Mr. Marchionne for more than a year disseminating the idea that Alfa's racing legacy will help sell sedans, sport-utility vehicles and roadsters. When Fiat Chrysler presented its five-year plan, Mr. Wester used more than a quarter of his presentation to recall the glory of Alfa's racing days.

Some analysts remain unconvinced. Sanford C. Bernstein auto-industry analyst Max Warburton last week wrote that FCA's plan for Alfa is unachievable and Mr. Marchionne's aggressive targets are part of "a high-stakes plan" aimed at making Fiat Chrysler more appealing to a potential buyer.

Mr. Marchionne has made no secret of wanting to find a partner so Fiat Chrysler can beef up and be better prepared for any market downturn. On Wednesday, he said an eventual deal involving Fiat Chrysler wouldn't impact the Alfa relaunch plan.

Alfa had fallen on hard times when Fiat acquired the company in the mid-1980s from an Italian state holding company. Fiat subsequently brought its namesake brand too close to Alfa with the result being a line of uninspiring Alfas that had no connection with the company's past, said Mr. Wester. More recently, Alfa has suffered from a lack of investment.

The way to set Alfa right, according to Mr. Wester, was to have a clearer separation from Fiat. To that end, Alfa set up a team of engineers, mechanics, machinists and designers in Modena, far from Fiat Chrysler's Italian head offices in Turin and close to the headquarters of Ferrari and Maserati, pricey sports-car brands also owned by Fiat. That allowed them to toil without the interference of "the Fiat Chrysler machine," said Mr. Wester.

The unveiling coincided with the inauguration of a newly expanded museum dedicated to Alfa in one of its decommissioned factories on the outskirts of Milan. As with everything else linked to the new Alfa car, the museum aims to be innovative while harking back to a proud heritage.

"It's like when the wife wants to watch a movie on television and the husband wants to watch the game, it seems impossible to find a solution, but we did it," said Benedetto Camerana, the architect who led the remodeling of the museum.

Write to Eric Sylvers at eric.sylvers@wsj.com

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