| Canon source | Backstage source | Novel source | DITL speculation |
| # | Series | Season | Source | Comment |
| 1 | TNG | 4 | Clues | |
| 2 | TNG | 6 | Face of the Enemy |
| Series : | TNG Season 4 |
| Episode : | Clues |
| Series : | TNG Season 6 |
| Episode : | Face of the Enemy |
| © Graham & Ian Kennedy | Page views : 18,892 | Last updated : 21 Mar 2004 |
