Third Doctor
From Tardis Wiki, the free Doctor Who reference
The Third Doctor is the third iteration of the Doctor.
Biography
The Doctor got U.N.I.T credentials during his time at U.N.I.T.(Full Fathom Five (audio story))
Repercussions
The Doctor used these credentials in order to gain Professor Volmer’s trust and gain access to the DEEP. (Full Fathom Five (audio story))
