Castor and Pollux

http://en.wikipedia.org/wiki/Castor_and_Pollux
In the myth the twins shared the same mother but had different fathers which meant that Pollux was immortal and Castor was mortal. When Castor died, Pollux asked Zeus to let him share his own immortality with his twin to keep them together and they were transformed into the Gemini constellation. The pair were regarded as the patrons of sailors, to whom they appeared as St. Elmo’s fire.
Also the names Castor and Pollux were used for the characters that actors Nicolas Cage and Alessandro Nivola played in the 1997 John Woo film Face/Off. Cage plays terrorist Castor Troy and Nivola plays his brother Pollux.
In the thriller movie The Relic, two police search dogs are named Castor and Pollux. One of them surviving, and one of them being killed by the beast.
Also, Castor and Pollux is the name of a pet food company.
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Image by Ann R. Raia from The VRoma Project