Star Trek #1: The Planet of No Return

This is the Enterprise a ship of the Star Fleet. It's five-year mission in space: to probe the far reaches of the galaxy, to search the unknown and unlock its mysteries, to boldly go where no man has ever gone before! An expedition team discovers its secret too late... K-G, Planet of Death!

The planet K-G is a plant dominated planet that sends out spores that change mammals into plants. They also eat mammals. The crew beams down five crewmen and you never know who will make it because no one wears red.