When an old favourite is rebooted by the Hollywood hit-making machinery, you have reasons to be worried.
The action-filled trailer introduces us to Bill Murray-voiced Baloo the bear, Ben Kingsley's Bagheera the panther, Idris Elba's villain Shere Khan and Christopher Walken's King Louie the orangutan.
It is moments like that which emphasise that this is not the animated retelling of Rudyard Kipling's classic that we have all learnt to love but an adult, frightening world.
However, the Iron Man director nods to the spirit of The Jungle Book as the trailer ends - we see Mowgli sitting on Baloo's tummy as they float down the river to the strains of Bare Necessities.