Article: Nana Visitor

Question: In what episodes of MacGyver did Visitor appear?
Answer: Visitor appeared as Laura Farren in the episode "Hellfire" of MacGyver in 1985 and as Carol Varnay in the episode "DOA: MacGyver".
Evidence table:
Year
Title
Role
Notes
1978–1979
Ryan's Hope
Nancy Feldman
Unknown episodes
1982
One Life to Live
Georgina Whitman
Unknown episodes
1985
Hunter
Amy Laurton
Episode: "The Biggest Man In Town"
1985
MacGyver
Laura Farren
Episode: "Hellfire"
1986
Knight Rider
Sandra Rusk
Episode: "Hills of Fire"
1986
Highway to Heaven
Margaret Swann
Two episodes
1987
MacGyver
Carol Varnay
Episode: "D.O.A.: MacGyver"
1987
Matlock
Vanessa Douglas
Episode: "The Best Friend"
1987
The Colbys
Georgina Sinclair
Four episodes
1988
Night Court
Ms. Sanders
Episode: "Educating Rhoda"
1988
In the Heat of the Night
Evie
Episode: "Fate"
1989
Matlock
Erin Whitley / Shannon Blackwell
Episode: "The Other Woman"
1989
Doogie Howser, M.D.
Charmagne
Episode: "The Short Goodbye"
1990
Working Girl
Bryn Newhouse
Unknown episodes
1990
Murder, She Wrote
Marcia McPhee
Episode: "See You In Court, Baby"
1993
Matlock
Dr. Clara Farmington
Episode: "The Divorce"
1993–1999
Star Trek: Deep Space Nine
Kira Nerys
OFTA Television Award for Best Actress in a Syndicated Series Unknown episodes
1998
The Outer Limits
Cecilia Fairman
Episode: "In Our Own Image"
2001
Dark Angel
Elizabeth Renfro
Six episodes
2003
Frasier
Sharon
Episode: "Daphne Does Dinner"
2004
According to Jim
Veronica
Episode: "Who's the Boss?"
2005–2008
Wildfire
Jean Ritter
Unknown episodes
2008
Battlestar Galactica
Emily Kowalski
Episode: "Faith"
2009–2014
Family Guy
Rita/Brenda Quagmire/Nancy Pelosi/Justin's Mom/Kate's Mom (voices)
12 episodes
2011
Torchwood: Miracle Day
Olivia Colosanto
Episodes: "Immortal Sins", "End of the Road"
2011
Grimm
Melissa Wincroft
Episode: "Beeware"
2017
Dynasty
Diana Davis
Episode: "Company Slut"

Question: Which role did Visitor appear for longer than 5 years?
Answer: From 1993–1999, Visitor appeared on Star Trek: Deep Space Nine as Kira Nerys.
Evidence table:
Year
Title
Role
Notes
1978–1979
Ryan's Hope
Nancy Feldman
Unknown episodes
1982
One Life to Live
Georgina Whitman
Unknown episodes
1985
Hunter
Amy Laurton
Episode: "The Biggest Man In Town"
1985
MacGyver
Laura Farren
Episode: "Hellfire"
1986
Knight Rider
Sandra Rusk
Episode: "Hills of Fire"
1986
Highway to Heaven
Margaret Swann
Two episodes
1987
MacGyver
Carol Varnay
Episode: "D.O.A.: MacGyver"
1987
Matlock
Vanessa Douglas
Episode: "The Best Friend"
1987
The Colbys
Georgina Sinclair
Four episodes
1988
Night Court
Ms. Sanders
Episode: "Educating Rhoda"
1988
In the Heat of the Night
Evie
Episode: "Fate"
1989
Matlock
Erin Whitley / Shannon Blackwell
Episode: "The Other Woman"
1989
Doogie Howser, M.D.
Charmagne
Episode: "The Short Goodbye"
1990
Working Girl
Bryn Newhouse
Unknown episodes
1990
Murder, She Wrote
Marcia McPhee
Episode: "See You In Court, Baby"
1993
Matlock
Dr. Clara Farmington
Episode: "The Divorce"
1993–1999
Star Trek: Deep Space Nine
Kira Nerys
OFTA Television Award for Best Actress in a Syndicated Series Unknown episodes
1998
The Outer Limits
Cecilia Fairman
Episode: "In Our Own Image"
2001
Dark Angel
Elizabeth Renfro
Six episodes
2003
Frasier
Sharon
Episode: "Daphne Does Dinner"
2004
According to Jim
Veronica
Episode: "Who's the Boss?"
2005–2008
Wildfire
Jean Ritter
Unknown episodes
2008
Battlestar Galactica
Emily Kowalski
Episode: "Faith"
2009–2014
Family Guy
Rita/Brenda Quagmire/Nancy Pelosi/Justin's Mom/Kate's Mom (voices)
12 episodes
2011
Torchwood: Miracle Day
Olivia Colosanto
Episodes: "Immortal Sins", "End of the Road"
2011
Grimm
Melissa Wincroft
Episode: "Beeware"
2017
Dynasty
Diana Davis
Episode: "Company Slut"