Human sacrifice

Human sacrifice was a religious act performed by the Aztecs. Barbara Wright wanted to use her power as an Aztec leader to end the practice, but the First Doctor told her not to alter history. (DW: The Aztecs)

The Master attempted to sacrifice Jo Grant to Azal, but the Third Doctor rescued her. (DW: The Dæmons)

In 1981, the Hecate Cult attempted to sacrifice Brendan Richards, but were stopped by Sarah Jane Smith and K9. (KAC: A Girl's Best Friend)