When Colter ( Justin Hartley) goes MIA while looking for a missing person, his team turns to his brother Russell ( Jensen Ackles) to help—and the episode adds to the Tracker mystery surrounding their father. (And yes, as with his first episode, there are plenty of moments that remind us of Ackles on Supernatural .)

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,

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.

When Ackles first appeared as Russell, the brother of Colton Shaw ( Justin Hartley) in season 1 of the hit CBS series, he was spotted patting a 1967 Chevrolet Impala before getting into Colton's truck. And in the new season, Ackles, 46, drives the car throughout the second episode.

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.