Quite a clever setup to this - agent Danvers (Rio 'Harker' Fanning) hides a vital despatch box inside a chest that's going to be used for a treasure hunt, then sends Steed an invitation to same. Steed visits the hunt organiser, proto-Clarkson Sir George Benstead (Arthur Lowe), who has a fantastic cutting-edge racing car simulator. Ominously, Sir George exposits that the simulator gives the driver mild electric shocks for veering off course: Steed is on the brink of persuading him to tell him where the treasure chest is, when he's killed by a non-mild electric shock from the simulator.
So the only way for Steed and Mrs Peel to find the despatch box is to take part in the treasure hunt. After that it turns a bit dull, and there's a very annoying character who blethers on about all her dead fiancés. It's a relief to get away from her and onto the final gag, with Mrs Peel as we've never seen her before.
Previously and also seen: Edwin 'Captain Hart' Richfield making his 5th appearance (the record so far, I think).
Also seen: Neil 'Thawn' McCarthy. Norman Bowler, who was one of the Tregennises in the Granada Devil's Foot.
Previously seen: Ivor Dean from The Removal Men.
