Final answer:
The Daleks were voted the greatest monster in the galaxy in 2010.
Step-by-step explanation:
The Doctor Who foe that was voted the "greatest monster in the galaxy" in 2010 by readers of SFX magazine was the Daleks. The Daleks are a fictional extraterrestrial race of mutants from the British science fiction television series Doctor Who. They are one of the Doctor's most iconic and formidable enemies, known for their robotic appearance, distinctive voices, and their relentless pursuit of exterminating all non-Dalek life.
Learn more about Doctor Who's greatest monster