Star Trek: The Original Series’ Most Powerful Villain Never Returned (But Still Could)
via screenrant.com
Short excerpt below. Read at the original source.
Plenty of powerful villains appeared in Star Trek: The Original Series. The Q-like Trelane, the godlike Gary Mitchell, and the Hulk-like Khan Noonien Singh all rank among Star Trek‘s strongest enemies. Many of these villains have continued to play a role in the franchise as the decades rolled by.