The CBS hit,CSI: Vegaspicks up, where its long-running predecessor,CSIleft off. Some familiar faces return for the spinoff, including fan favorite Gil Grissom(William Peterson),as well asMarg Helgenbergerreprising her role as CSI Catherine Willows. Fast-paced and action-packed,CSI: Vegasgives viewers a birds-eye view into Las Vegas' underbelly through the lens of the Las Vegas Crime Lab, and its investigators.

Across the franchise,CSI’scharacters have always been compelling, andCSI: Vegasis no different. The introduction of new characters like Maxine Roby(Paula Newsome),who leads the CSI team, and Season 2’s Beau Finado(Lex Medlin), breathes new life into the franchise. These are the best characters ofCSI: Vegas– old and new.

William Peterson as Gil Grissom on CSI: Vegas.

10Gil Grissom

Grissom and his wife Sarah(Jorja Fox)return to the lab inCSI: Vegasto investigate the attempted murder of their friend and former colleague, LVPD detective Jim Brass(Paul Guilfoyle) –alsofrom the original series.The investigation leads them to try to prove the innocence of former lab tech David Hodges(Wallace Langham)against charges of falsifying evidence in previous cases.

RELATED:Will Peterson’s 10 Best Movies and TV Shows

Gil Grissom and Sarah Sidle on CSI: Vegas.

Grissom has always been by the book, and unwavering in his commitment to choosing science over emotion. Though a fan-favorite onCSI, Grissom can be annoying which hampers his likability; he often lacks emotion and the inability to empathize with others' perspectives.

9Sarah Sidle

Sarah is convinced that Hodges is being framed, despite Grissom’s skepticism. Admittedly, Sarah’s likability vastly increased from the originalCSIwhere she was seen as one-note. But her insistence on proving Hodges' innocence softens Sarah.

Sarah never resonated with viewers, and there’s not much difference in her character onCSI: Vegas. With so many strong and confident female characters, Sarah’s continued ties to Grissom make her seem more like a follower than a leader. This is disappointing for fans who would like to see Sarah exude more independence and strength.

Wallace Langham as David Hodges on CSI: Vegas.

8David Hodges

Former CSI lab tech, David Hodges, returns in a recurring role after he’s accused of fabricating evidence in criminal cases. Good at his job, Hodges was always a bit odd and never fit in with the camaraderie of the other crime scene investigators.

RELATED:‘CSI’ 10 Saddest Character Exits, Ranked

Married and expecting a child, Hodges' vulnerability is a refreshing change for the character. Arrested and facing imprisonment, Hodges' new life is jeopardized. Now an expert witness, viewers root for Hodges – upping his likability.

7Serena Chavez

LVPD detective Serena(Ariana Guerra)isn’t favorable in the beginning. A bit brash, Serena tries too hard when investigating her cases and rubs viewers the wrong way. That changes in later episodes when Serena is personally affected by one of her cases.

It’s not surprising that Serena is so straight-laced, coming from a family with high expectations. Driven to prove herself takes away from the humanity of Serena’s character that would otherwise endure viewers.

Ariana Guerra as Serena Chaven on CSI: Vegas.

6Chris Park

Jay Leestars as low-level CSI Chris Park in both seasons ofCSI: Vegas. His recurring role in Season 1 sets the stage for Park’s growth in Season 2. Park has good chemistry with CSIs Josh Folsom(Matt Lauria)and Ahayla Rajan(Mandeep Dillon), but is eclipsed by both in the first season, which keeps him from making a real impression on viewers.

Things change for Park in Season 2, when he’s propelled to a more prominent role on the show. This is highlighted in Season 2, Episode 10, “Eyeballs,” where viewers get a chance to really see Park in action when helps solve a brutal murder.

Jay Lee as Chris Park on CSI: Vegas.

5Ahayla “Allie” Rajan

Allie is a people pleaser. Despite moving from Mumbai and following her dream of living in Vegas, she struggles with her love of crime scene investigation and making her boyfriend happy. Allie’s chemistry with Folsom is undeniable, even though she recently moved in with her boyfriend.

Allie’s uncertainty detracts from her character. She’s a talented CSI, but it’s obvious to viewers thatshe’s not as confident as she should be. She constantly asks Folsom what she should do about her boyfriend’s overbearing ways, and it gets annoying to say the least. But Allie gets along with everyone and is great at her job.

4Josh Folsom

Folsom is focused. In theCSI: Vegasseries premiere, it’s difficult to tell much about Folsom’s personality but that quickly changes. A close friend to Allie, Folsom gives her advice without overstepping his bounds. Folsom’s likability only increases as the season goes on and this continues into Season 2.

It’s obvious that Folsom’s feelings for Allie go beyond the lab. This is more evident in Season 2, Episode 1, “She’s Gone,” where Serena mentions to Allie that Folsom has told the LVPD detective a lot about Allie. Folsom’s pining for Allie is relatable and makes him even more likable because he respects her.

3Catherine Willows

Marg Helgenberger returns as Catherine Willows, and the stripper turned crime scene investigator hasn’t changed much from the original series. Willows' return delighted fans as she made her debut in Season 2 ofCSI: Vegas.

RELATED:‘CSI: Vegas’ Season 2 Sets Marg Helgenberger to Return as Catherine Willows

After being gone for nearly a decade, Willows asks Maxine for her old job back. “The job is in my blood – it always will be,” Willows tells Maxine. Investigating the murder of a dominatrix, Willows doesn’t miss a beat. Willows exudes both the sexiness and intelligence that viewers ofCSIknow and love.Willow’s dedication to getting justicefor victims who would otherwise be forgotten is what solidifies her likability.

2Maxine Roby

Head of the crime scene investigations, Maxine is likable from the beginning. Viewers can tell that she loves her job and that she’s loved and admired by her team as well.

Maxine is professional, and enthusiastic and approaches the job with an open mind. The mother of a 20-year-old, Maxine engages the CSIs and emits empathy and compassion in every scene. Maxine is one of the strongest women on the show, and one of the most likable.

1Beau Finado

Beau is fun to watch onCSI: Vegasas the laid-back guy we all wish we knew – and dad we all wish we had. Though Beau acts as comedic relief in Season 2, this makes him no less professional or lovable as a character. Beau immediately became a fan favorite.

Beau has a good heart and longs for something more than being in the lab. He’s a natural nurturer, which viewers get to see when he takes to a non-verbal boy he meets on a case. Beau’s interactions with the little boy provide one ofCSI: Vegas’most heartwarming episodes. Folsom acknowledges Beau’s engagement with Michael, calling his colleague a “teddy bear.” While all the characters onCSI: Vegasare likable in their own way, Beau outshines them all.

NEXT:10 Best Cop Procedurals That Aren’t ‘Law and Order’