Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

What's missing: Magnum Force, The Enforcer, Sudden Impact, and The Dead Pool?
sudden impact

Which American actor and singer has joined Amanda Holden as one of the judges on the current series of 'Britain's Got Talent'?
britain's got talent

In 'The Blue Lamp', who plays the young villain who shoots George Dixon?

the blue lamp