Avengers: Infinity War - Predicting The Entire Plot In 20 Steps
8. Strange Is Kidnapped & Tortured, The New Science Bros Chase The Black Order To Space
The Black Order's reason for invading New York is obviously to get their hands on the Time Stone, with Ebony Maw and Black Dwarf (confusingly being referred to as Cull Obsidian in the marketing) deployed to attack Doctor Strange. He, Wong, Iron Man and Bruce Banner (with help from Spider-Man) make a stand but Ebony Maw will gain a victory initially, over-powering Strange and kidnapping him.
He's then taken aboard the giant donut ship as the Order retreat to take him back to Thanos, only for Spider-Man to jump on the ship as it escapes and Iron Man to follow using his new armour technology to chase the ship. The three reconvene aboard the ship when Iron Man and Spidey interrupt Maw torturing Strange.
Having met up with Tony Stark in the wake of the Black Order ship's invasion, Peter Parker gets his hands on the new Iron Spidey suit, complete with new added arms.
Banner doesn't go - presumably because without his Hulk form he has no easy means to get to space. Spider-Man has his new suit, Iron Man has his armour, Strange can teleport... Banner can only pilot a ship and he's literally JUST been stranded on Sakaar for two years, so you can understand why he might be reluctant.