There are 12 models of the Cylon agent. Currently 6 are known to the characters, but viewers know of 7.
Number One | Number Two | Number Three | Number Four | Number Five | Number Six |
Number Seven | Number Eight | Number Nine | Number Ten | Number Eleven | Number Twelve |
These agents have yet to be referred to by their number, but fit into the scheme above:
Number Unknown a.k.a. Leoben Conoy |
Number Unknown a.k.a. Simon |
Number Unknown a.k.a. Cavil |