Which 'Scorch Trials' Star Knows Dylan O'Brien The Best?

We've got your back, Dylan.

In "Maze Runner: The Scorch Trials," Dylan O'Brien has two lovely ladies on his scorching hot team of pseudo-rebels: Kaya Scodelario, who is back as Teresa, and newcomer Rosa Salazar, who stars as Brenda. Of course, this means that everyone and their mother -- MTV News included -- has already asked O'Brien which of the two ladies he thinks his character, Thomas, should end up with. (The answer he gave us, of course, was "both.")

However, we at MTV News felt that -- given the extreme closeness of Thomas' relationship with the dudes from the Glade -- the quest for Thomas' (well, Dylan's) true BFF shouldn't be limited to Brenda and Teresa alone. Therefore, when the cast showed up to our studios for a little pre-"Scorch" chat, we put them to the test on their Dylan O'Brien 101.

Who knows the "Scorch Trials" and "Teen Wolf" star best? Find out for yourself:

"Maze Runner: The Scorch Trials" hits theaters on September 18.