b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] Tom Campbell - Diehard Cop [Exp.] Movie [Type] Ref [In-joke] 
The subtitle refers to the Diehard movie series because he's so often in similar, "battling from the inside against impossible odds" situations.
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke