Tlotoxl

Tlotoxl (in Azteca, Tlohtoxcatl) was an Aztec High Priest of Sacrifice in the 15th century.

When Barbara posed as the reincarnation of Yetaxa and called off the human sacrifice of the first victim, Tlotoxl declared her a false god and tried poisoning her to prove her mortality. However, his plan failed when Barbara offered them the drink. At the solar eclipse, Tlotoxl tried stabbing Barbara, but Ian Chesterton caught him. Ian and Barbara left for the TARDIS, and Tlotoxl was offered the Perfect Victim as a sacrifice. (TV: The Aztecs) He and Tonila later prepared cocoa in honour of vanquishing Barbara. (HOMEVID: Making Cocoa)

Twenty years later, Tlohtoxcatl still held the role of High Priest. Momacani described him as appearing totally caked in soot and grime, smelling of body odour and faecal matter. However, despite his severity, Tlohtoxcatl was popularly perceived as a good man with a strong heart. (PROSE: Against Nature)

Behind the scenes

 * Tlotoxl is one of the few Doctor Who villains who never receives any sort of comeuppance.
 * John Ringham based his performance as Tlotoxl on Laurence Olivier's interpretation of Richard III.
 * Tlotoxl is mentioned briefly in Lawrence Burton's rejected BBC novel Smoking Mirror.  It is revealed that Tlotoxl only made it into the priesthood with his uncle's help and eventually died by accidentally sacrificing himself. The Sixth Doctor admits that he never "took to the fellow at all." This novel would later be self-published on Lulu and connects to the author's Against Nature. 
 * Lawrence Burton changed the spelling of the character's name to the correct "Tlohtoxcatl" when writing Against Nature.