“Knight Watch”
Harry is brought before a Senate investigative committee. One of Cypher's cyber men goes bonkers. A rare powerstone is found in the Antarctic. Checkmate attempts to infiltrate Cypher's organization.
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Checkmate #29 (1988) is issue #29 of DC's Checkmate (1988–1991), with a cover date of July 1990. Written by Paul Kupperberg and drawn by Tom Grindberg.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.