|Full Name||Horatio Stark|
|Occupation||Chief Agent Officer of M.I.9|
|First Episode||Run, Carrie, Run!|
|Last Episode||The Lost Hero|
|Portrayed By||Jonathon Rhodes|
He showed some concern in, "The Octopus", for their safety, not just because they weren't fulfilling the mission properly. Whenever the MI High kids are involved, they usually out manuveur him, which adds to his hatred of them. He doesn't get along that well with Carrie as she has an attitude and answers back.
Stark is first shown as an incompetent agent, but, due to him being of a very high rank, the show made him slightly more useful, he had a long run of bad luck but had some successful missions which he is proud of.
- In the episode, "Run, Carrie, Run!", he is shown to be a competent enough agent, but, very bad under pressure.
- In "Run, Carrie, Run!", he met Carrie Stewart, Rose Gupta, and Oscar Cole, and even though they had only been with him for a few minutes, the spies quickly distrusted him.
- In the episodes, "Don't Cook Now" and "Return of the Mummy", the head of M.I.9 gets cross with him for his idiocy.
- In the episode,"Return of the Mummy", he is nearly fired after M.I.9 security is broken.
He is a fairly stupid agent who is head of most operations at M.I.9. It is shown in "Run, Carrie, Run!" he is completely useless under pressure. He disapproves of Frank London and his M.I. High team. He makes several mistakes in his career, the biggest being he trusted Oscar's mother, Jade Dixon Halliday, who turned out to be a double agent.
- In the episode "Doppelgängers", his ringtone is revealed to be 'The Cheeky Girls' and that he used to date Andrea Ivanovic.
- In the episode "The Octopus", it is revealed he has some concern for the M.I. High agents.
- From Series 6 onwards, he is replaced by Stella Knight .