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Discovery Two is an unfinished spacecraft mentioned in both 2010: Odyssey Two, and the 1984 film adaptation 2010, but is never actually seen. Little information is given about the ship, but it is explained in the novel that Discovery Two is being constructed under the supervision of Dr. Curnow to rendezvous with Discovery One and to investigate the failure of the HAL 9000 unit aboard the Discovery One. The construction of the ship is halted after the American taskforce instead travels in the Russian-built Alexei Leonov, as it would take too long to wait for Discovery Two to be completed.