"Crater One Hundred And One," stylised as "Crater 101," is an instalment of Captain Scarlet And The Mysterons in which Captain Scarlet, Captain Blue, and Lieutenant Green are assigned both to destroy a complex that the Mysterons are building in crater 101 of the Humboldt "Sea" of Luna and to remove its power source so that its component matter cannot reverse itself. It is the second part of the "Lunarville Trilogy," of which Lunarville 7" is the first part and of which "Dangerous Rendezvous" is the third part.