Star Trek The Next Generation #21: Chains of Command

While exploring a group of devastated class-M planets in a remote sector of space, the crew of the U.S.S. Enterprise ™ is shocked to discover a group of human slaves on a forbidding, glacial world. When the slaves revolt against their human overseers, Captain Picard and his crew sympathize with the slaves plight but cannot interfere in the conflict.
After the revolt is a success, Captain Picard learns that both the slaves and the overseers were controlled by a mysterious bird-like race cal...