In Enterprise, Blalock played Subcommander T'Pol, a Vulcan diplomat on Earth who was initially assigned by Vulcan Ambassador Soval (a recurring role played by Gary Graham) as an observer on the ship's first mission, in the pilot episode "Broken Bow". At the end of that episode, she is asked to remain on Enterprise as its science officer by Captain Jonathan Archer (played by Scott Bakula). As the series progressed, she assumed the position of first officer, and at the start of the third season Xindi story arc, she resigns her Vulcan position to remain on Enterprise when the Vulcan High Command orders her back to Vulcan. Early in the fourth season, she formalizes her position in Starfleet and is granted a field commission of commander, retaining her role as the ship's first officer, where she remained for the rest of the series.
Blalock has not participated in conventions or given interviews regarding her role on Star Trek: Enterprise except for FedCon XIV in May 2005, but did agree to join a 2013 cast reunion for an interview during the Blu-ray conversion and production. She also appeared as a parody version of herself attending a Star Trek convention in a 2009 episode of the sitcom 10 Items or Less titled "Star Trok."
Attending her first Trek event in almost a decade, Blalock walked the red carpet for 2021's Star Trek Day on September 8, 2021.
2003–2017
Blalock appeared in the film Slow Burn, which was shot in 2003 between seasons two and three of Enterprise, unveiled at the Toronto International Film Festival in September 2005, and saw limited theatrical release in 2007.
Blalock guest-starred in two episodes of Stargate SG-1 as Ishta, leader of a group of rebel female warriors.
Blalock was scheduled to appear on an episode of Lost during the 2005–2006 season. Though she filmed some scenes, they were never used in an episode nor featured as "deleted scenes" in the DVD set's bonus material. Set photos from the shooting of a scene surfaced in 2008.
In Starship Troopers 3: Marauder, which was released direct-to-video on August 5, 2008, Blalock played Captain Lola Beck who led a mixed group of survivors on a journey across an alien infested wasteland.
Blalock played Lexa, the wife of a hospitalized porn star, in the 2009 episode "Teamwork" on the series House.
In the second season of Legend of the Seeker, appearing in the January 2009 episodes "Dark" and "Perdition", Blalock played Sister Nicci, a Sister of the Dark.
Blalock had a supporting role as Stacy in the action thriller Sinners and Saints (2010).
Until 2024, Blalock's most recent roles were in the direct-to-video Killing Frisco (2014) and then the TV movie A Man for Every Month (2017).
2024–present
Blalock returned to acting to voice an alternate universe version of her Star Trek: Enterprise character in the Star Trek: Lower Decks fifth season episode "Fissure Quest". She was credited mononymously as Jolene in the episode. In 2025, it was announced that she had been cast in Rebel Wilson's film Girl Group where she again was credited as Jolene. She also co-produced and appears in the 2026 Green Day-inspired coming-of-age film Nimrods.
Personal life
Blalock is married to Michael Rapino, CEO of Live Nation. Rapino lived in England and Blalock lived in the U.S. while working on Star Trek: Enterprise. She proposed to him and they married in Negril, Jamaica, on April 22, 2003. They have three sons. Rapino and Blalock founded the Rapino Foundation, which helps populations in the developing world. Blalock is also an avid supporter of the Make-A-Wish Foundation.
Blalock is a dog fancier and has appeared on the cover of the UK's K9 Magazine.
Filmography
Film
{| class="wikitable sortable"
|-
! Year
! Title
! Role
! class="unsortable" | Notes
|-
| 2000
| Queen for a Day
| Hot Babe in Yellow
| Short
|-
| 2005
| Slow Burn
| Nora Timmer
|
|-
| 2007
| Shadow Puppets
| Kate Adams
|
|-
| 2008
| Starship Troopers 3: Marauder
| Capt. Lola Beck
| Video
|-
| 2010
| Sinners and Saints
| Stacy
|
|-
| 2011
| One Kine Day
| CC
|
|-
| 2012
| Troubled Teen
| Mama
| Short
|-
| rowspan="2"|2014
| Sex Tape
| Catalina
|
|-
| Killing Frisco
| Jolene
|
|-
| 2026
|
| Deborah
| Also co-producer
|-
|
|
|
| Filming
|}
Television
{| class="wikitable sortable"
|-
! Year
! Title
! Role
! class="unsortable" | Notes
|-
| 1998
| Veronica's Closet
| Woman #3
| Episode: "Veronica's Breast Efforts"
|-
| 1999
| Love Boat: The Next Wave
| Woman
| Episode: "Prom Queen"
|-
| rowspan="4"|2000
| G vs E
| Libby
| Episode: "Cougar Pines"
|-
| D.C.
| Kristi
| Episode: "Truth", "Justice"
|-
| Jason and the Argonauts
| Medea
| TV miniseries
|-
| CSI: Crime Scene Investigation
| Laura Garris
| Episode: "Crate 'n' Burial"
|-
| rowspan="3"|2001
| JAG
| Cpl. Lisa Antoon
| Episode: "Touch and Go"
|-
| On the Edge
| Charlie's Wife
| TV film
|-
| '
| Ruby Grange
| TV miniseries
|-
| 2001–2005
| Star Trek: Enterprise
| T'Pol
| Main role
|-
| 2003
| MTV Icon
| Herself
| Episode: "Metallica"
|-
| 2003–2004
| Stargate SG-1
| Ishta
| Episodes: "Birthright", "Sacrifices"
|-
| 2006
| I Dream of Murder
| Joanna
| TV film
|-
| 2008
| CSI: Miami
| Feratelli Porter
| Episode: "Bombshell"
|-
| rowspan="2"|2009
| House
| Lexa
| Episode: "Teamwork"
|-
| 10 Items or Less
| Herself
| Episode: "Star Trok"
|-
| 2010
| Legend of the Seeker
| Sister Nicci
| Episodes: "Dark", "Perdition"
|-
| 2017
| '
| Brenda
| TV film
|-
| 2024
| Star Trek: Lower Decks
| Alternate T'Pol
| Episode: "Fissure Quest"; credited mononymously as Jolene
|}