Tennis star Kelly Robinson and his trainer, Alexander Scott, travel around the world, going from one tournament to another, without a care in the world. But things are not always as they seem. For they are both international spies and their jet-setting lifestyle is the perfect cover for their highly dangerous assignments.
Season One: 28 episodes
| Ep | PN | Airdate | Title |
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| 1 | 3A | Sep 15/65 | So Long, Patrick Henry |
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| 2 | | Sep 22/65 | A Cup of Kindness |
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| 3 | | Sep 29/65 | Carry Me Back to Old Tsing-Tao |
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| 4 | 6A | Oct 06/65 | Chrysanthemum |
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| 5 | 7A | Oct 13/65 | Dragon's Teeth |
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| 6 | 8A | Oct 20/65 | The Loser |
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| 7 | 4A | Oct 27/65 | Danny Was a Million Laughs |
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| 8 | 10A | Nov 03/65 | Time of the Knife |
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| 9 | 9A | Nov 10/65 | No Exchange on Damaged Merchandise |
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| 10 | 11A | Nov 17/65 | Tatia |
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| 11 | 12A | Dec 01/65 | Weight of the World |
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| 12 | 14A | Dec 08/65 | Three Hours on a Sunday Night |
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| 13 | 13A | Dec 15/65 | Tigers of Heaven |
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| 14 | 1A | Dec 29/65 | Affair in T'Sien Cha |
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| 15 | 16A | Jan 05/66 | Tiger |
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| 16 | 17A | Jan 12/66 | The Barter |
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| 17 | 15A | Jan 26/66 | Always Say Goodbye |
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| 18 | 18A | Feb 02/66 | Court of the Lion |
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| 19 | 20A | Feb 09/66 | Turkish Delight |
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| 20 | 19A | Feb 16/66 | Bet Me a Dollar |
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| 21 | 21A | Feb 23/66 | Return to Glory |
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| 22 | 22A | Mar 02/66 | The Conquest of Maude Murdock |
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| 23 | 23A | Mar 09/66 | A Day Called 4 Jaguar |
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| 24 | 25A | Mar 23/66 | Crusade to Limbo |
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| 25 | 26A | Mar 30/66 | My Mother, the Spy |
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| 26 | 27A | Apr 06/66 | There Was a Little Girl |
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| 27 | 28A | Apr 13/66 | It's All Done With Mirrors |
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| 28 | 24A | Apr 27/66 | One Thousand Fine |
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Season Two: 28 episodes
| Ep | PN | Airdate | Title |
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| 29 | | Sep 14/66 | So Coldly Sweet |
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| 30 | | Sep 21/66 | Lori |
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| 31 | | Sep 28/66 | Sophia |
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| 32 | | Oct 05/66 | Vendetta |
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| 33 | | Oct 12/66 | A Gift From Alexander |
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| 34 | | Oct 19/66 | Trial by Treehouse |
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| 35 | | Oct 26/66 | Sparrowhawk |
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| 36 | | Nov 02/66 | Will the Real Good Guys Please Stand Up? |
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| 37 | | Nov 09/66 | Bridge of Spies |
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| 38 | | Nov 16/66 | One of Our Bombs is Missing |
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| 39 | | Nov 23/66 | To Florence With Love |
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| 40 | | Nov 30/66 | To Florence With Love, Part 2 |
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| 41 | | Dec 07/66 | Lisa |
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| 42 | | Dec 14/66 | Little Boy Lost |
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| 43 | | Dec 21/66 | Father Abraham |
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| 44 | | Dec 28/66 | Rome Take Away Three |
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| 45 | | Jan 04/67 | Tonia |
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| 46 | | Jan 11/67 | Child Out of Time |
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| 47 | | Jan 25/67 | The Trouble With Temple |
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| 48 | | Feb 01/67 | The Warlord |
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| 49 | | Feb 08/67 | A Room With a Rack |
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| 50 | | Feb 22/67 | Mainly on the Plains |
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| 51 | | Mar 01/67 | Get Thee to a Nunnery |
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| 52 | | Mar 08/67 | Blackout |
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| 53 | | Mar 15/67 | Magic Mirror |
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| 54 | | Mar 22/67 | Night Train to Madrid |
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| 55 | | Mar 29/67 | Casanova From Canarsie |
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| 56 | | Apr 12/67 | Cops and Robbers |
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Season Three: 26 episodes
| Ep | PN | Airdate | Title |
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| 57 | | Sep 11/67 | Let's Kill Karlovassi |
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| 58 | | Sep 18/67 | Beautiful Children |
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| 59 | | Sep 25/67 | Laya |
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| 60 | | Oct 02/67 | The Medarra Block |
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| 61 | | Oct 09/67 | Philotimo |
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| 62 | | Oct 16/67 | The Honorable Assassins |
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| 63 | | Oct 23/67 | Now You See Her, Now You Don't |
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| 64 | | Oct 30/67 | Red Sash of Courage |
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| 65 | | Nov 13/67 | The Seventh Captain |
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| 66 | | Nov 20/67 | Apollo |
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| 67 | | Nov 27/67 | Oedipus at Colonus |
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| 68 | | Dec 11/67 | The Lotus Eater |
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| 69 | | Dec 25/67 | American Empress |
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| 70 | | Jan 08/68 | Home to Judgement |
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| 71 | | Jan 15/68 | Anyplace I Hang Myself is Home |
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| 72 | | Jan 22/68 | Tag, You're It |
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| 73 | | Jan 29/68 | A Few Miles West of Nowhere |
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| 74 | | Feb 05/68 | This Guy Smith |
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| 75 | | Feb 19/68 | Turnabout For Traitors |
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| 76 | | Feb 26/68 | Happy Birthday, Everybody |
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| 77 | | Mar 04/68 | Shana |
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| 78 | | Mar 11/68 | The Name of the Game |
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| 79 | | Mar 25/68 | Suitable For Framing |
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| 80 | | Apr 01/68 | The Spy Business |
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| 81 | | Apr 08/68 | Carmelita is One of Us |
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| 82 | | Apr 15/68 | Pinwheel |
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| | Feb 03/94 | I Spy Returns (two hours) |
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| | Nov 01/02 | I Spy (97 mins) |
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