Over at My Geek Life, they are exploring the 100 Greatest things about Star Trek. They just posted 51 thru 75. Unleash your inner geek and enjoy.
Arena made the list. It's the episode where Kirk fights the Gorn.
In Star Trek: The Next Generation, they did a similar episode called Darmok.
And this is the difference between Picard and Kirk.
In Darmok, Picard refuses violence, throws away a knife. Then he spends time with the enemy and learns to communicate in a language of metaphors.
In Arena, Kirk throws a lot of rocks and then makes gun powder.