Usually a 4-disc or 5-disc set containing all 20 episodes.
The show stars (Castle, Firefly) as John Nolan , a 40-something divorcee from Pennsylvania who, after helping police during a bank robbery in his small town, decides to chase his lifelong dream. He moves to Los Angeles and becomes the LAPD’s oldest rookie. the rookie season 1 complete pack 2021
In the collectibles market, "Rookie Season 1 Complete Pack 2021" often refers to sports trading card releases from that year. Usually a 4-disc or 5-disc set containing all 20 episodes