The Substitute
| Episode Number | 4 |
|---|---|
| Season | 6 |
| Aired | 2010-02-16 |
| Overview | Locke goes in search of help to further his cause. Kate finds herself on the run, while Jack is tasked with something that could put a friend's life at risk. |
| Runtime | 44 minutes |
| Absolute Number | 0 |
| Finale Type |