Karen Gillan understands why Nebula wasn't in the trailer for 'Avengers: Infinity War'.

Just two weeks ago the trailer for the highly anticipated movie dropped and fans went wild after seeing many of their favourite characters in the Marvel Cinematic Universe film - including Captain America (Chris Evans), Iron Man (Robert Downey Jr) and Spider-Man (Tom Holland).

However, the bald, blue alien assassin Nebula - who is a regular in the 'Guardians of the Galaxy' movies - was absent but Gillan, who plays her, admitted ''it makes sense'' why she wasn't featured in the teaser footage.

Speaking to RadioTimes.com, Gillan said: ''I wasn't really disappointed because also it sort of makes sense ... it makes sense! How do I say this without giving anything away? It makes sense - I feel like Nebula might be in future trailers.''

Nebula was last seen at the end of 'Guardians of the Galaxy Vol. 2' on a mission to find mad titan Thanos, her adoptive father, and murder him.

Thanos - who will be played by Josh Brolin and featured in the trailer - stole her and her ''sister'' Gamora (Zoe Saldana) from their parents and turned them into killing machines prior the first 'Guardians of the Galaxy' movie.

And Gillan admitted this backstory is set to be developed in the upcoming ensemble movie.

She said: ''It's gonna be so good! A lot of stuff that we have planted in previous films is going to all come together in quite an explosive way, I would say. Daddy issues will be faced. Thanos is the big bad guy, the ultimate supervillain, so this is the biggest fight that the 'Avengers' will ever have. And being his daughter, Nebula will get entwined in there somehow.''

And Gillan has promised the forthcoming movie is going to be ''the most epic, cinematic event of all time''.

Speaking previously to BANG Showbiz, she said: ''It's amazing. It's going to be the most epic, cinematic event of all time.''