Mortal Kombat hidden characters: the full series list
Secret fighters across the original trilogy and the spin-offs, with the version each one appears in.
Applies to: Secret fighters in the 1992 to 2003 games
Quick answer
Mortal Kombat hid extra fighters in most of its early games, and the versions in Legacy Kollection confirm which ones. The secret fights named by the collection are Reptile in Mortal Kombat, Jade, Smoke and Noob Saibot in Mortal Kombat II, Smoke and Noob Saibot in Mortal Kombat 3, Noob Saibot again in Ultimate Mortal Kombat 3, Tremor in Special Forces, and the Fire God and the T-Rex Rider in Mythologies.
What counts as hidden
The Mortal Kombat series used two different ideas that are often described with the same word, and separating them makes the rest of this page easier to read.
| Type | How it works | Examples |
|---|---|---|
| Secret fight | An opponent who is not on the select screen and only appears when a condition is met during a run. Beating them is the point. | Reptile, Jade, Smoke, Noob Saibot in the arcade trilogy |
| Unlockable fighter | A character who becomes selectable after an in-game action, or through a menu. | The collection’s No More Secrets option does this directly |
This page covers the secret fighters in the period Legacy Kollection collects, which runs from 1992 to 2003. The later games use their own systems — Mortal Kombat 1, for example, attaches its extra fighters to downloadable content rather than to secret fights, which is covered on the MK1 page.
The original trilogy
The arcade trilogy is where the idea of a secret fighter was established, and the collection confirms the roster of them.
| Fighter | Appears in | Notes |
|---|---|---|
| Reptile | Mortal Kombat (1992) | The first secret fighter in the series and the template for the ones that followed. In the original he reuses another character’s moves. |
| Jade | Mortal Kombat II | Appears as a secret fight before becoming a regular roster member in later games. |
| Smoke | Mortal Kombat II and Mortal Kombat 3 | Starts as a hidden opponent and is promoted to a playable character in Mortal Kombat 3, where he is hidden again under different conditions. |
| Noob Saibot | Mortal Kombat II, Mortal Kombat 3 and Ultimate Mortal Kombat 3 | Appears in three of the arcade games, each with its own trigger. |
Noob Saibot is the awkward one for anyone working from memory. Because he appears in three games, three of the collection’s achievements cover the same character in different versions, and a guide that describes one of those fights as the Noob Saibot fight is describing only a third of the picture. The Legacy Kollection hidden characters page lists each of them against its version.
The spin-offs
The two spin-off titles contribute three more, and they are the least known of the group.
| Fighter | Appears in | Notes |
|---|---|---|
| The Fire God | MK Mythologies: Sub-Zero | A hidden fight inside an action-adventure title rather than a fighting game. |
| The T-Rex Rider | MK Mythologies: Sub-Zero | One of the more obscure additions in the collection. |
| Tremor | MK: Special Forces | The rarest of the secret fights in the collection; Tremor later became a playable character in other games, but this appearance is the early one. |
How fights are triggered
The conditions for these fights changed over the years, and some of the conditions most widely quoted today no longer apply in the collection.
- The conditions are not described on this page in detail, because they differ by version and are shown inside each game.
- If you want the fights for their own sake, the collection ships an official option that unlocks the hidden characters directly, covered on the hidden characters page.
- If your goal is the achievements, the fights themselves have to be played; the shortcut does not hand them over. The achievement roadmap groups them by difficulty.
- Where a source describes a trigger without naming the version, treat it as unconfirmed for the version in front of you.
Sources and review scope
- Steam — Legacy Kollection achievement list — used to confirm which fighters exist as secret fights and in which version of each game.
- Digital Eclipse — Online Arcade update — used for the change to the Noob Saibot secret fight condition.
- Digital Eclipse — Legacy Kollection game page — used for the feature list including No More Secrets.
- Steam store listing — used for the contents summary of the collection.
The fighter list here is limited to secret opponents that the collection itself names. The wider series contains many more characters with unusual unlock routes across the later games, and reproducing an exhaustive series-wide list would mean relying on sources that are not official. Where a condition has been documented by the developer it is stated above; otherwise the page directs you to the in-game screens rather than reproducing a condition that may not apply to the version you are playing.
Checked against linked Digital Eclipse updates, Atari and Steam store listings, and the in-game achievement list on October 13, 2026. Dynamic details such as player counts and patch state should be rechecked before publication.
Not independently play-tested. This is not a claim that every platform or game version was tested. Source review: Oct 13, 2026.
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