The Ravagers

The Ravagers might not be key players in the battle against Thanos, but there is every chance that they could be involved in some way.

They proved themselves to be capable allies in the good fight – alongside the Guardians of the Galaxy and the Nova Corps – in the first Guardians movie and they are set to return in future instalments.

While only their leader, Yondu, has demonstrated any notable superpowers (his ability to control his arrow by whistling was impressive, as he killed numerous Sakaaran soldiers effortlessly), they do have a fleet of spacecrafts – known as M-ships – that could be useful in any aerial battles that might occur.

Given their nature – they are essentially space pirates who travel the galaxy looking for ways to make money (or units) – they could come into conflict with the Mad Titan as he seeks to acquire the Infinity Stones. These are items that interest the Ravagers, as they could sell them for a princely sum, and this could easily result in them bearing a grudge against the big-bad of the franchise when he gets to them first.