Season 2 of "Tracker," CBS's number 1 show, airs Sunday nights, and ET got an exclusive interview with star Justin Hartley and guest star Jensen Ackles. They dish about their 20-year friendship and what it's like working together for the first time.

Jensen Ackles' first Tracker episode of the season is sure to get Supernaturalfans pretty revved up. When Ackles first appeared as Russell, the brother of Colton Shaw (Justin Hartley) in season 1 of the hit CBS series,

Tracker brought back Jensen Ackles‘ character, Russell, in season 2 - and the Supernatural Easter eggs followed. During the newest episode, which aired on Sunday, October 20, Justin Hartley‘s character,

Tracker Season 2 is only two episodes deep, but the hit CBS show’s spectacular guest star streak is going strong. Season 2’s premiere let Manifest‘s Matt Long show his range, and the second episode of the sophomore season marks the moment Supernatural fans have been waiting for.