[s6e18] Knockout Access

Vance travels to Chicago with Ziva and McGee, focusing on local crime boss Joe Banks as a primary suspect.

The most discussed element of this episode among fans on platforms like Reddit is the implication that Leon Vance may have switched identities with Tyler Owens. "NCIS" Knockout (TV Episode 2009) - IMDb [S6E18] Knockout

Feeling sidelined, Gibbs conducts a parallel investigation into Vance’s past. This creates a "sparring match" between the two leaders as Gibbs uncovers discrepancies in Vance's official records. The "Identity Switch" Mystery Vance travels to Chicago with Ziva and McGee,