| Canon source | Backstage source | Novel source | DITL speculation |
| # | Series | Season | Source | Comment |
| 1 | TOS | 1 | Where No Man Has Gone Before | |
| 2 | ENT | 3 | Impulse | |
| 3 | TOS | 1 | The Naked Time |
| Series : | TOS Season 1 |
| Episode : | Where No Man Has Gone Before |
| Series : | ENT Season 3 |
| Episode : | Impulse |
| Series : | TOS Season 1 |
| Episode : | The Naked Time |
| © Graham & Ian Kennedy | Page views : 10,689 | Last updated : 3 Apr 2014 |
