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Professor Logan was a scientist who claimed to have planned and executed the first manned mission to Venus. As UNIT had funded the project, the Brigadier sent the Third Doctor to investigate Logan's claims before agreeing to further funding. The Doctor examined some Venusian rock samples and discovered that they were actually from Earth. Investigating further, he deduced that Professor Logan had faked the mission to use UNIT funds for the upkeep of his ancestral home. To keep the Doctor quiet, Logan had him placed in a rocket and launched into space. However, the Doctor took control of the rocket and threatened to crash it into Logan's castle. Logan confessed his fraud and the Doctor returned to Earth. (COMIC: Doctor Who and the Rocks from Venus)