Yu-Gi-Oh! 5D's episode 25: "The Fortune Cup Finale, Part 1"
Langly (unnamed in the Japanese version) is a guard who works for Rex Goodwin.
In the English dub, after Trudge expressed concerns over the danger of continuing the Fortune Cup tournament, Goodwin called Langly to escort Trudge out of his box room. Yusei Fudo then entered and asked if Langly was the name of one of the two guards who had been outside, because if so, Langly was "napping"; Yusei had just knocked them both unconscious.