Retro Replay Review

Gameplay

The first stretch of Leviathan works because it lets you investigate before it asks you to shoot. Hackett’s urgent request pulls Shepard toward Dr. Bryson’s Citadel lab, and the expansion’s research-oriented structure gives the campaign a different rhythm from Mass Effect 3’s usual race from crisis to crisis. You chase clues, speak with other characters, and travel between the Citadel, Normandy, and new points in the galaxy. If you enjoy the quieter moments where Mass Effect lets you put pieces together, this is immediately engaging.

It also integrates cleanly into the main game rather than trapping you in a separate side story. Between missions you are back aboard the Normandy, free to pursue other assignments, upgrade gear, and talk with the squad as usual. Those conversations matter: the squad’s comments make the discovery feel like something the crew is processing together, not a sealed-off DLC episode. Start it after Priority: Palaven when it becomes available, then let it breathe alongside the campaign instead of rushing through it in one sitting.

When the investigation turns violent, Leviathan does not abandon Mass Effect 3’s shooter fundamentals. Several missions feature hard fights against powerful Reaper servants, so the slower opening is not a sign that this is purely detective work. The AT-12 Raider Shotgun, M-55 Argus Assault Rifle, weapon mods, war assets, and Dominate power are useful extras, particularly if turning an enemy temporarily against its allies suits your build. Still, the gear is a bonus; the investigation is the reason to be here.

Graphics

The familiar Citadel and Normandy spaces make the expansion feel embedded in Mass Effect 3, while the new galaxy destinations give Shepard’s search a welcome change of scenery. The strongest visual contrast comes from moving between the controlled familiarity of the ship and Citadel hub areas and missions shaped by the Reaper threat, where combat encounters carry more immediate pressure.

Story

This is the DLC to play if the Reapers always felt more compelling as a question than as an army of enemies. Leviathan goes directly after an ancient being said to be capable of killing a Reaper, then uses that pursuit to answer long-standing questions about the Reapers’ origins. It is a big swing, and it earns its place by addressing material that reaches back to the beginning of the series.

The expansion’s best quality is that it treats those answers as something Shepard must uncover. The revelations concerning the Reaper race, Sovereign, and the Collectors land better because they emerge from a mystery rather than arriving as a dry lore briefing. The pacing can feel more deliberate than a standard combat mission, but that is precisely what gives the discoveries room to register.

Be clear-eyed about what it changes. Leviathan adds related dialogue to the final stretch, but it does not alter Mass Effect 3’s ending. That may frustrate anyone buying it in search of a different conclusion. For everyone else, it provides valuable context that makes the trilogy’s central threat more intelligible and, in places, more unsettling.

Overall Experience

Leviathan is a worthwhile expansion because it understands that Mass Effect’s universe is not sustained by firefights alone. The mixture of investigation, conversations, Normandy downtime, and bursts of difficult combat makes this feel like a real chapter in Shepard’s campaign rather than a pile of challenges with lore attached.

Its limits are equally clear. The core loop remains familiar, the rewards will not transform your loadout, and the ending remains the ending. But the new answers are substantial enough to justify the trip, especially for anyone who finished the trilogy still wanting a firmer grasp on what the Reapers are and how their history connects to earlier villains.

If you are playing through Mass Effect 3 again, slot this into the campaign after Palaven and take time to hear your squad’s reactions. Fans comparing versions can also look at Mass Effect 3: Special Edition, while Leviathan’s release history offers useful background. As an add-on, it is not essential to finishing the war, but it is one of the better reasons to linger in it.

Retro Replay Score

7.2/10