"Doctor Who" was a science-fiction BBC TV show about a time-traveling humanoid alien.

Today is its 50th anniversary.

To celebrate that, Google has created an interactive, multi-level game. You choose a character and then try to beat six levels, avoiding aliens, ghosts, and more to flip switches, obtain a letter that spells "Google," and get back to a phone booth. Google times you on your mission to grab all the letters.

Here are some screen grabs below:

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