(written from a Production point of view)
He is best known for his Emmy-nominated role in the TV series Wiseguy from 1987 through 1990. He also appeared in the films Airplane! (1980) with Gregory Itzin, Kenneth Tobey and Jason Wingreen, 48 Hrs (1982) with Denise Crosby (TNG's Natasha Yar) as well as TNG guest actor Margot Rose, Gremlins (1984) with Zach Galligan, Dick Miller and Keye Luke, Beverly Hills Cop (also 1984) with Steven Berkoff, Michael Champion, Ronny Cox and Douglas Warhit,Freejack (1992, with Mike Starr) and Crocodile Dundee in Los Angeles (2001) with John Billingsley, Kaitlin Hopkins, and Matt Winston. Due to his appearance in Beverly Hills Cop, Banks once again worked for producer Jerry Bruckheimer on the series CSI: Crime Scene Investigation playing mobster Bobby Jensen. In 2004 and 2006 in the fifth and sixth seasons respectively appearing in the episodes "Formalities" and "Kiss Kiss Bye Bye". Both times working with Voyager guest star Wallace Langham.
Banks had a starring role in the short-lived 1985 science fiction series Otherworld. This show had guest contributions from many Star Trek performers (Michael Rider, Ray Walston, Kevin Scott Allen, Mark Lenard, Michael McGrady, Robert O'Reilly, Brian Thompson, Ian Abercrombie, John D. Gowans, Michael Ensign, Warren Munson, Estee Chandler, Vincent Schiavelli, Ivy Bethune, Earl Boen, Dennis Howard, Susan Powell, Barbara Townsend, Merritt Yohnka, Larry Cedar, Alex Daniels, Byron Morrow, Carolyn Seymour, and Douglas Alan Shanklin) and included direction by Corey Allen and Richard Compton despite only lasting eight episodes. He also was a regular on the sitcom Fired Up with Sharon Lawrence for two seasons. Fired Up was executive produced by TNG guest star Kelsey Grammer.
Banks more recently appeared in two episodes of J.J. Abrams' hit series Alias (working with Terry O'Quinn and Jimmie F. Skaggs) and had recurring roles on the shows E-Ring (co-starring with Alan Dale, James MacDonald and Robert Picardo) and Day Break (with Michael McGrady, Clayton Rohner, Jim Beaver, John Rubinstein and Michael Buchman Silver and directed by Rob Bowman), also starring John de Lancie. He appeared in Columbia Pictures drama Reign Over Me, also with de Lancie.
Banks first played Mike Ehrmantraut on AMC's Breaking Bad in 2009, Season 2 Episode 12. He is sent to get rid of evidence after the girlfriend of one of the main characters ODs. The girl's father was played by John de Lancie. Response was so strong that Banks' role was expanded to that of supporting player. In 2011, Breaking Bad was nominated for a Screen Actors Guild award for Outstanding Performance by an Ensemble in a Drama Series category.