In the latest round of pilot castings, Dennis Hopper has joined NBC's "E-Ring," Regina Taylor has come on board CBS' "The Unit," Elizabeth Rohm and Charles Mesure are set to topline Fox's "Briar & Graves," Jennifer Esposito has been cast in the WB Network's untitled Liz Tuccillo project, Paul Blackthorne has landed the lead in ABC's "Pros & Cons," and Joely Fisher and Matt Letscher have been tapped as the leads in Fox's untitled Jablonski/Katims project.

In other pilot casting news, Thomas Gibson has come on board CBS' "Quantico," Brent Spiner has joined CBS' "Threshold," Rob Estes has joined ABC's "Soccer Moms," Brooke Burns and Rider Strong have been cast in the WB's "Pepper Dennis," and Dan Cortese and John DiMaggio have joined the WB's "Grown Men."

"E-Ring," from WBTV and Bruckheimer TV, is a behind-the-scenes ensemble drama set at the Pentagon. Hopper will play a colonel with a lifelong commitment to the military.

Hopper, who earlier this development season was attached to a comedy project for NBC, is repped by ICM and Bloom Hergott Diemer Rosenthal La Violette.

"The Unit," from 20th Century Fox TV, revolves around the lives of the members of a Special Forces unit and their families.

"Briar & Graves," from 20th TV and Adelstein-Parouse Prods., revolves around a hard-living priest (Mesure) who partners with a female doctor (Rohm) to investigate unexplained religious phenomena.

Rohm, who played assistant district attorney Serena Southerlyn on "Law & Order" for four years, next appears in "Miss Congeniality 2." She is repped by Paradigm, Brillstein-Grey and attorney Bob Myman.

Mesure ("Boogeyman), a well-known TV actor in New Zealand, is repped by Greene & Associates Talent Agency.

The untitled Liz Tuccillo project, from WBTV and Class IV Prods., revolves around four adult sisters, one of them played by Esposito, who navigate career, romance and relationships.

Esposito, who most recently recurred on CBS' "Judging Amy," next appears in the feature "Crash." She is repped by Gersh, Washington Square Arts and attorney Michael Fuller.

"Pros & Cons," from Touchstone TV and Bad Robot, is a stylish caper focusing on a group of con artists who work for the FBI. Blackthorne will play the leader of the crime gang.

Blackthorne, who played a villain on Fox's "24" last season, also recurred on NBC's "ER." He is repped by Ro Diamond and Susie Schwarz of SDB Partners and Seven Summits Pictures & Management.

The untitled Jablonski/Katims project, from 20th TV and Imagine TV, revolves around the staff at a fertility clinic.

Fisher, who most recently starred in the Lifetime series "Wild Card," is repped by Gersh, manager Carrabino and attorney David Weber.

Letscher, who co-starred on NBC's "Good Morning Miami," is repped by the APA Agency.

"Quantico," from Touchstone TV and Paramount Network TV, is a suspense thriller that centers on the workings of the FBI Behavioral Analysis Unit. Gibson will play a member of the unit.

"Dharma & Greg" star Gibson, who most recently starred in CBS' mini "Category 6: Day of Destruction," is repped by the Gersh Agency and manager Craig Dorfman.

"Threshold," from Paramount, revolves around a team of scientists and military personnel who come into contact with a mysterious alien life-form.

Spiner, a veteran of the sci-fi genre as Data on Paramount's "Star Trek: The Next Generation" and a series of "Star Trek" movies, is repped by Innovative Artists and attorney Don Steele.

"Soccer Moms," from Touchstone TV, revolves around two suburban housewives (Kristin Davis, Gina Torres) who team up as private investigators.

Estes will play the husband of Davis' character. He is repped by ICM and Thruline.

20th TV's "Pepper Dennis" stars Rebecca Romijn as an ambitious TV news reporter.

Burns (Fox's "North Shore") is repped by Paradigm and manager Barbara Stark.

Sony Pictures TV's "Grown Men" revolves around five former fraternity brothers.

Cortese, who most recently appeared in the WB's "Rock Me Baby," is repped by Gersh.

DiMaggio (Fox's "Futurama") is repped by Gersh and manager Maureen Taran.