Saucer separation for the
Constitution-class, suggested by the ship's design but never seen on film, has made non-
canonical appearances. In the
DC Comics Star Trek: Debt of Honor, Kirk used "explosive bolts" to sever the connection between the saucer module and the engineering section of the USS
Farragut. The same trick was used again in the DC Comics
Star Trek: The Mirror Universe Saga, where Kirk and his crew escaped the self-destruction of the ISS
Enterprise's engineering section in a last-minute separation. Another
Constitution-class ship, the USS
Confederate, was shown operating without its saucer section in
Marvel Comics Star Trek Unlimited Issue 4; after the crew abandoned the
engineering hull via
saucer separation due to a failure in an experimental propulsion system upgrade. In the early drafts of
Star Trek: The Motion Picture, the
Enterprise was to separate the saucer. The
2006 Star Trek: Ships of the Line calendar includes a picture of a separated
Constitution-class ship, engaging Klingons – or possibly a Klingon ship flown by the Romulans – in battle.