Serge is a green sea snake. He is one of Dexter's minions, alongside the sharks.
Serge is a green snake. He has a caudal fin on his tail, which has a strong resemblance to the tail of an eel.
With expert knowledge behind many of Dexter's plans, Serge is an intelligent snake. Truly the "brain" of his troupe, Serge is never praised by his master. Unless something goes wrong, Serge is given credit for his master.