Q is a fictional character who appears in the television series Star Trek: The Next Generation, Star Trek: Deep Space Nine and Star Trek: Voyager, as well as in related products. In all of these programs, he is played by John de Lancie.
Q has nearly omnipotent powers, and is continually evasive regarding his motivations. His home, the Q Continuum, is accessible only on the rare occasions permitted, and the true nature of it is said to be beyond the comprehension of "lesser beings" such as humans.
Beginning with the pilot episode of Star Trek: The Next Generation, Q became a recurring character, with pronounced comedic and dramatic chemistry between himself and Captain Jean-Luc Picard.
Q is a mischievous, threatening, omnipotent being who has taken an interest in humans. Q's power is limited only in that he cannot overcome others in his home universe, the Q Continuum. He can stop death, create life, travel through time, stop time, multitask/create multiple versions of himself and create entire worlds effortlessly. He can change a person's mind or make them take any action.
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Official Site: Paramount Television
Links: Q Wikipedia page Q StarTrek.com page StarTrek.com