Series: Star Trek: The Original Series
Season 1, Episode 22
Original Air Date: February 16, 1967
|via Memory Alpha
"Space Seed" introduced Khan Noonien Singh, a villain who continues to fuel Trek stories in the 21st century. Khan is the leader of a group of genetically engineered super-humans discovered aboard an early model Earth vessel adrift in space. Amazingly, the group had been preserved in a sleeping state for centuries, before being awoken by our heroes. Khan and his gang attempt to take over the Enterprise. The story explores the nature of man as Captain Kirk and his friends wrestle with Earth's troubled past and Khan questions whether the character of humans has advanced apace with technology.
|via Corona Coming Attractions
Montalbán reprised the role of Khan in 1982's Star Trek II: The Wrath of Khan, undoubtedly his most enduring big screen performance. Wrath of Khan is considered by many to be the very best Trek film and Montalbán is a big reason why. Benedict Cumberbatch proved a worthy successor playing the part in 2013's Star Trek: Into Darkness.
Montalbán was married to his wife Georgiana Belzer for 63 years. The couple had four children. He died of congestive heart failure at the age of 88.