"We are now in a flying donut, billions of miles from Earth with no backup." ― Iron Man
Q-Ships are massive spaceships used by Thanos and the Black Order. These ring-shaped vessels were stored inside the even larger Sanctuary II, and Thanos deployed them during his invasions of Zen-Whoberi and Earth.
Thanos' invasion of Zen-Whoberi, several Q-Ships patrolled the skies of the planet.
"Holy shit. We're all gonna die! There's a spaceship!" "What's the matter with you kids, you've never seen a spaceship before?" ― Ned Leeds and the Watcher Informant
In order to claim the
Eye of Agamotto
, two members of the
, flew to
in a Q-Ship, where they confronted the
Master of the Mystic Arts
. Finding himself to be unable to take the Eye from Strange, Maw beamed himself and an unconscious Strange to the Q-Ship, where Maw began torturing Strange for possession of the Eye.
Black Order members
Corvus Glaive and Proxima Midnight used a Q-Ship to travel to Edinburgh to claim the Mind Stone from Vision. The two managed to corner the android and Scarlet Witch in a train station before being ambushed by Steve Rogers, Black Widow and Falcon, which resulted with Glaive being gravely wounded. Knowing that the odds are against them, Midnight beamed herself and Glaive back up to their Q-Ship and fled from the area.
"This ship is self-correcting its course. Thing's on autopilot." "Can we control it? Fly us home? Stark?" "Yeah." "Can you get us home?" "Yeah, I heard you. I'm thinking... I'm not so sure we should." ― Tony Stark and Doctor Strange Iron Man
broke into the Q-Ship to rescue
and stop his captor,
, from retrieving the
. They killed Ebony Maw by ejecting him into space and stayed with Strange in the ship, which was traveling to
, so that they could defeat
. Iron Man and Spider-Man crashed the vessel on Titan, where it was soon stormed by the
Guardians of the Galaxy
Having located the
Mind Stone in Wakanda, the Black Order sent from a Q-Ship several Outrider Dropships in order to invade the country.
The meaning behind the name "Q-Ship", first revealed by Entertainment Weekly , has not yet been clarified; the ship was never referred to by that name in  . However, the side view of the ship does visually resemble the letter "Q", suggesting that "Q-Ship" is a colloquialism for the vehicle.
Avengers: Infinity War