The Wild Wild West - Season 3 Episode 3 : The Night of the Assassin 1969

As United States and Mexican border relations are becoming stained,West and Gordon disrupt an assassination attempt on the Mexican President. While returning the captured assassin to Texas,they are fired upon by Mexican soldiers who are led by the merciless Colonel Barbossa. The assassin,just before he is captured,is given a pill by Gordon that makes him appear dead. Then Gordon,disguised as a priest in a wagon,goes to the prison to pick up the dead prisoner.