• Animal & Farm Party
  • Balloons & Party Supplies
  • Bouncy Castles
  • Cakes & Catering
  • Climbing Parties
  • Combat Parties
  • Cooking Parties
  • Craft Parties
  • Dance & Pop Star Parties
  • Disco Parties
  • Face Painters
  • Gaming Bus & Arcade Parties
  • Karting Parties
  • Laser Tag Parties
  • Limo & Party Bus
  • Makeover & Pamper Parties
  • Outdoor Adventure
  • Party Entertainers
  • Pottery Parties
  • Science Parties
  • Soft Play Parties
  • Sports Parties
  • Swimming Parties
  • Theme Park Parties

Adventure Birthday Parties In Milton Keynes

Welcome to Si5 SpyMissions

SpyMissions is a series of puzzles and challenges set aboard the battle cruiser UNS Steadfast

It has a brilliant storyline which brings it to life, from covertly boarding the vessel to the adrenaline-fuelled escape! making it the most exciting experience you will ever have

The most incredible party experience

A birthday party at Spy Missions is an hour of fantastic fun with party food to follow

Your children will go on an amazing, undercover mission, accompanied by their very own guide who will make it a thrilling experience while ensuring your children are happy and safe.

A spy mission lasts approximately 1 hour. A typical party at Spy Missions lasts about 2 hours dependent on numbers attending.

Party Food

The children select their meal choice before entering the mission, and this is freshly cooked while they are saving the world! Your party table will be set up whilst your children are in their mission and food is served within a few minutes of the mission finishing.


Your mission, should you choose to accept it…

We have four missions, written to suit different ages and groups. To read more, select your mission from the list below:

  • Operation: Malice’s Revenge
  • Operation: Shadow Force
  • Operation: Covert Sword
  • Operation: Broken Arrow