Related Clues:

• More than impress
• Knock the socks off
• Leave speechless
• Take aback
• Sandbag
• Blow out of the water
• Astound
• Phaser setting, on 'Star Trek'
• Daze
• Surprise greatly
• Render speechless
• Leave open-mouthed
• Sci-fi setting
• Benumb
• Take by surprise