b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] Sherwin - Alien Expert [Exp.] 9D [Type] Ref [In-joke] 
The name is a hommage to the creator of UNIT, Derrick Sherwin, who wrote their first appearance, "The Invasion".
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke