Marina Sirtis (Lamper)

With several minor film roles under her belt (when she bothered to wear any clothing on-screen), Marina auditioned in 1986 for the role of Security Chief Macha Hernadez on the then-new Star Trek the Next Generation series while fellow actress Denise Crosby auditioned for Counselor Deanna Troi.
Gene Roddenberry liked the performers, but felt they didn't fit the roles they auditioned for, and switched them around, renaming the now-blonde Security Chief "Tasha Yar."
The rest, as they say, is future history...

Genre appearances include...
Young Justice (Queen Bee)
Green Street Hooligans 2 aka Green Street 2: Stand Your Ground
(Veronica)
DoomsDay [2009] (Paxton)
Grudge 3 (Gretchen)
Inalienable (Crystal Barry)
The Deep Below (Sarah)
Grendel (Queen Wealhtheow)
Family Guy"Not All Dogs Go to Heaven" "Peter's Got Woods" (Herself)
Lesser of Three Evils aka Blood Money aka Fist of the Warrior (Mary)
Spectres aka Soul Survivor (Laura Lee)
Threat Matrix "Doctor Germ"
StarGate SG-1 "WaterGate"
Gene Roddenberry's Earth: Final Conflict "The Cloister"
Outer Limits [1999] "The Grell"
GadgetMan (Detective Inspector Walker)
WaxWork II: Lost in Time (Gloria)
Star Trek the Next Generation /
Star Trek Generations /
Star Trek Generations the Video Game /
Star Trek First Contact /
Star Trek Insurrection /
Star Trek Nemesis /
Star Trek Voyager /
Star Trek Enterprise /
Star Trek: A Final Unity
(Counselor Deanna Troi)
Gargoyles (Demona)
Return of Sherlock Holmes "Six Napoleons"
Blind Date [1984] aka Deadly Seduction (Hooker)
Check out...
Marina's Official Site

Lacey Nicole Chabert

Though she started out as a singer on Star Search, Lacey quickly discovered a talent for acting and made it her primary career.
She appeared on Broadway in Les Miserables, then moved to daytime tv on All My Children, then to prime-time on Party of Five, playing her best-known role; Claudia Salinger.
Since then, she's done quite a bit of animation voice work, including Meg Griffin on Family Guy's first season and Gwen Stacy on Spectacular Spider-Man, as well as a variety of featured movie roles and tv guest appearances.

Genre appearances include...
The Lost (Jane)
Spectacular Spider-Man (Gwen Stacy)
Chaotic (Krystella)
RayMan: the Animated Series (Betina)
Ghost Whisperer "Love Still Won't Die"
Black Christmas [2006] (Dana Mathis)
Family Guy [1999-2000] (Meg Griffin)
Lost in Space [1998] (Penny Robinson)
American Dragon: Jake Long (Jasmine)
Disney's Hercules "Hercules and the Kids"
When Secrets Kill (Jenny Newhall)
Ahhh!!! Real Monsters (Tiffany)
Disney's Gargoyles (Bobbi Porter)

Check out...
Lacey Chabert Central (FanSite)
LaceyRealm (FanSite)

Other actresses to play Meg Griffin include...
Rachel MacFarlane in Family Guy "Death Has a Shadow" (Pilot)
Mila Kunis in Family Guy[2000-Present]
Tara Strong (singing voice) in Family Guy

Other actresses to play Gwen Stacy include...
Bryce Dallas Howard in Spider-Man 3
Mary Kay Bergman in Spider-Man [1998]

Other actresses to play Penny Robinson include...
Angela Cartwright in Lost in Space [1965-68]