No-one knows. For most of human civilization the use of spies can be documented and for the rest it can be expected.
Stop and think for a moment. How could we ever be sure of the answer?
You have to be a secret agent to get the spy phone.
On the tallest mountain.
To be a real secret agent you have to work for the government
Secret Agent? lol
The Secret Agent was created in 1907-09.
Dr. No
you have to be a secret agent and then you have to go to the sports shop at ski village and click on the first curtain
secret agent clank
Secret Agent X ended in 1939.
Secret Agent X was created in 1934.
Secret Agent Fireball was created in 1965.
Secret Agent of Terra was created in 1962.