BasicsDoctor Who envelopes ordinary people in a modern setting into a brand new universe that most people don't have a clue exists. This is a concept that the Unearthed Arcana setting for d20 Modern runs with. Just replace monsters with aliens and magic with technology and you have the same exact game. You can practically use any class or any race from any d20 Modern suppliment or guide, including from any time period! Wanna see a tyrranosaurus rampage through Tokyo? Wanna have a laser pistol packing cowboy? Sure. As long as your gamemaster says it's okay.
Nessesary Publications: d20 Modern Core Rulebook and d20 Future.
Recommended: d20 Future Tech, d20 Past and d20 Menace Manual. All published by Wizards of the Coast, Inc.
CharactersAny of the basic classes are fair game for standard character creation. If your dealing with higher level campains, especially not ones set on modern day Earth, I would definately allow some aliens in as player character races. I might even allow a time traveller as a new starting occupation for a character.
New Starting Occupation: Time TravellerTime travellers hail from all over the known universe. They come from all races and genders, some actually performing a service to government bodies, such as Time Agents, while others just hitch a ride to wherever or whenever a fellow time traveller is going.
Prerequisite: Age 15+
Skills: Choose any two of the following skills as perminant class skills. If a skill you select is already a class skill you recieve a +1 competence bonus on checks using that skill.
Computer Use, Knowledge (technology, time or history), Survival.
Bonus Feat: Select one from either Alien Weapons Proficiency (pg. 11; d20 Future), Planetary Adaptation (pg. 13; d20 Future) or Spacer (pg. 13; d20 Future).
Wealth Bonus Increase: +1
( More d20 Who within the cut... )