/usr/bin/lcm-spy is in liblcm-bin 1.3.1+repack1-1+b1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 | #!/bin/sh
exec java -server -Djava.net.preferIPv4Stack=true -Xincgc -Xmx128m -Xms64m -ea -cp /usr/share/java/lcm.jar:/usr/share/java/jchart2d.jar lcm.spy.Spy $*
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