The TARDIS lands in the late 21st century, on the Great Solar Shield — according to the Tenth Doctor, the single greatest achievement of the 21st century. It is designed to partially block the sun, to stall the effects of global warming. The Doctor and Martha go into the control room, where the staff are shocked by their arrival. The commander of the ship explains the sun shield was never meant to be accessed from outside. Every member of the crew will die from radiation poisoning in five years. Suddenly, a large object appears on the scanner, heading toward the sun shield. The Doctor recognises it as more than an asteroid. It is a swarm of Silhouettes, energy parasites from the dark places of the universe. The Silhouettes swarm the shield. Crew member Tanaka is turned to dust by their touch. When a Silhouette tries to attack Martha, however, it screeches and flies away.
Back in the control room, the Doctor sees that the Silhouettes are leaving the sun shield and heading for Earth instead. He quickly realises that the Silhouettes are allergic to bright colour — like the colour of Martha's T-shirt — and alters the path of the sun shield to create a rainbow, making the Silhouettes flee. The sun shield, under strain from the attack, begins to break up, so the Doctor takes everyone on board back to Earth in the TARDIS. The group watch as the sunlight breaks free from the sun shield for the first time in years.
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- Sunscreen is the only comic strip to appear in the 2008 storybook.
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