Star Trek: The Next Generation

Deja Q - S3-E13

Corrected entry: Q talks about changing the moon's gravitational constant, and thus "altering its mass." Scientifically, changing gravitational attraction wouldn't affect its mass.

Correction: Q actually said "Change the gravitational constant of the UNIVERSE." In other words, change the law of gravity so that it functions differently and the moon's relative mass effectively changes, something members of the Q continuum are capable of.