John Gettier portrayed UN Security Guard in Black Panther, NYPD in Avengers: Infinity War, Firefighter in Ant-Man and the Wasp, S.H.I.E.L.D. Agent in Captain Marvel, S.W.O.R.D. Agent in the WandaVision episodes Now in Color, We Interrupt This Program, On a Very Special Episode... and All-New Halloween Spooktacular!, and German Prison Guard, German SWAT, and GRC Security in The Falcon and The Winter Soldier episodes Power Broker and Truth.
- John Gettier is one of the actors who have portrayed multiple characters in the Marvel Cinematic Universe.
- John Gettier also portrayed Swat Team #9 in the Sony Pictures Studios production Venom.
- John Gettier is one of the actors to portray characters for both Marvel Television and DC Entertainment. He portrayed ASA Agent in Black Lightning.
- John Gettier portrayed Submarine Crew in Aquaman and Fairfax Police Officer in Wonder Woman 1984. This makes him one of the few actors to date to have appeared in both the Marvel Cinematic Universe and the DC Extended Universe.