| Canon source | Backstage source | Novel source | DITL speculation |
| # | Series | Season | Source | Comment |
| 1 | TOS | 1 | Charlie X | |
| 2 | TNG | 7 | Genesis |
| Series : | TOS Season 1 |
| Episode : | Charlie X |
| Series : | TNG Season 7 |
| Episode : | Genesis |
| © Graham & Ian Kennedy | Page views : 11,332 | Last updated : 8 Nov 2003 |
