No Man’s Sky players who are fans of the beloved sci-fi series Mass Effect will soon be in for a treat: Mass Effect’s legendary SSV Normandy SR-1 starship will be appearing in No Man’s Sky.

The Normandy’s arrival is the culmination of an alternate reality game that’s taken place inside No Man’s Sky over the past few days. If you want to add the Normandy to your frigate fleet (a group of ships you dispatch on missions), you have until May 31st to participate in the expedition (an event where players share an adventure on the same planet) that lets you acquire it.

Image: Hello Games

The crossover arrives just a week after the release of Mass Effect Legendary Edition, a new remaster of the popular series.

No Man’s Sky is coming up on its five-year anniversary this August, and developer Hello Games is continuing to support the title with big new updates. Those shared expeditions, for example, were added in March, while an update in February added the ability to let you adopt wild animals as pets.