Numbuh Captain is the KND operative that gives out Numbuhs to new recruits. So far, there are two both in each KND division. The first one in splinter cell is Numbuh 1-0 who only takes orders from Numbuh 320. The second one in the Moon base is Numbuh 2-0 who only takes orders from Numbuh 362.
Numbuh 1-0: He is an experimental clone, looks exactly like Numbuh 2. Put sunglasses on to not confuse.
Numbuh 2-0: He is an experimental clone, looks exactly like Numbuh 1-0.