| Canon source | Backstage source | Novel source | DITL speculation |
| # | Series | Season | Source | Comment |
| 1 | TOS | 1 | Where No Man Has Gone Before | |
| 2 | TOS | 2 | Friday's Child | |
| 3 | Star Trek VI : The Undiscovered Country | |||
| 4 | TNG | 6 | Relics | |
| 5 | TOS | 2 | The Deadly Years |
| Series : | TOS Season 1 |
| Episode : | Where No Man Has Gone Before |
| Series : | TOS Season 2 |
| Episode : | Friday's Child |
| Film: | Star Trek VI : The Undiscovered Country |
| Series : | TNG Season 6 |
| Episode : | Relics |
| Series : | TOS Season 2 |
| Episode : | The Deadly Years |
| © Graham & Ian Kennedy | Page views : 34,316 | Last updated : 2 Apr 2014 |
