Q is a fictional character in
Star Trek: The Next Generation,
Star Trek: Deep Space Nine, and
Star Trek: Voyager, as well as in related media. In all of these programs, he is portrayed by
John de Lancie. Q is a being who is unconstrained by, and indeed possesses power over, normal human notions of
time,
space, and even
reality itself - he and his fellow Q are said to be
omnipotent, and he is continually evasive regarding his motivations. The name "Q" also applies to all other individuals of the Q Continuum - an
alternate dimension accessible to only the Q and their guests. The true nature of the realm is said to be beyond the comprehension of "lesser beings" such as humans, therefore it is shown to humans only in ways they can understand.