Maureen Biologist (45 episodes, 1999-2013)
Sara (45 episodes, 1999-2013)
Kacie (45 episodes, 1999-2013)
Steven (45 episodes, 1999-2013)
Billy Blazes (37 episodes, 1999-2013)
Wendy Waters (37 episodes, 1999-2013)
Jake Justice (36 episodes, 1999-2013)
Bill Barker (36 episodes, 1999-2002)
Rocky Canyon (34 episodes, 1999-2013)
Jack Hammer (34 episodes, 1999-2013)
Cliff Hanger (34 episodes, 1999-2013)
Roger Houston (32 episodes, 1999-2013)
Gil Gripper (32 episodes, 1999-2013)
Ariel Flyer (17 episodes, 2001-2002)
Ariel Flyer (13 episodes, 1999-2000)
Hal E. Copter (12 episodes, 2000-2003)
Warren Waters (9 episodes, 1999-2002)
Al Pine (7 episodes, 2001-2002)
Sam Sparks (7 episodes, 2001-2002)
Rip Rockefeller (6 episodes, 2001-2003)
Bob Buoy (5 episodes, 2001-2003)
Matt Medic (5 episodes, 2001-2002)
Bike Shop Owner / Canadian Airplane Pilot / Criminal on Highway / Firefighter at Skyscraper / Man in Apartment Window / San Francisco Firefighter (1906) (5 episodes, 2001-2002)
Sandy Beach (3 episodes, 2001)
Sergeant Siren / Sargent Siren (3 episodes, 2001-2002)
Willy Stop (3 episodes, 2001-2002)
Perry Chute / British Paramedic #2 (3 episodes, 2001-2003)
Jill Hammer / Nancy Grey (3 episodes, 2001-2002)
Lead Whaler / San Francisco Firefighter (1906) / Wendy's Pilot (3 episodes, 2001-2002)
Pat Pending (3 episodes, 2001-2002)
San Francisco Firefighter (1906) / Whaler #1 (2 episodes, 2001-2002)
Aang / Calcutta Rescue Team Leader (2 episodes, 2001-2002)
Dr. Perez / Foreman (2 episodes, 2001-2002)
Bob Sled (2 episodes, 2001-2002)
Paraplegic Man / Submarine Crewman 2 (2 episodes, 2001-2002)
Speeding Yellow Car Driver / Whaler #2 (2 episodes, 2001-2002)
Carter (2 episodes, 2001)
Parachuter / Truman Largo (2 episodes, 2001)
Dynamite Factory Employee / Retirement Home Resident #1 (2 episodes, 2002)
Aiden Assist (2 episodes, 2002)
Additional Voices (1 episode, 1999)
Steve (1 episode, 2000)
Sean's Mom (1 episode, 2001)
Loraby (1 episode, 2001)
Tyler (1 episode, 2001)
Cameraman in Wendy's Flashback (1 episode, 2001)
Mike's Wife (1 episode, 2001)
Bullet Train Supervisor (1 episode, 2001)
Bud Grey (1 episode, 2001)
Coach (1 episode, 2001)
Jessica (1 episode, 2001)
Submarine Captain (1 episode, 2001)
Avery Ator (1 episode, 2001)
Dan (1 episode, 2001)
Stan (1 episode, 2001)
Window Washer #1 (1 episode, 2001)
Mike (1 episode, 2001)
Construction Worker at Skyscraper (1 episode, 2001)
Paraplegic Man's Wife (1 episode, 2002)
Seymour Wilde (1 episode, 2002)
Bickering Neighbor #1 (1 episode, 2002)
Mr. Kravitz (1 episode, 2002)
Princess (1 episode, 2002)
King (1 episode, 2002)
Retirement Home Resident#2 (1 episode, 2002)
Tanker Driver (1 episode, 2002)
Ben Choppin (1 episode, 2002)
Retirement Home Resident #3 (1 episode, 2002)
Jake's Mother (1 episode, 2002)
Young Oliver Waters (1 episode, 2002)
Urv (1 episode, 2002)
Sara (1 episode)
Jake Justice (Pilot) (unknown episodes)
Kenny Ride (uncredited) (1 episode, 2002)