Paramount has unleashed the official trailer for the Transformers spin-off prequel Bumblebee [TFRM6], the sixth film in the franchise based on the toy series. Set in the 1980s, the yellow Autobot befriends a teenager, played by Hailee Steinfeld [HSTEI], while staying ahead of a military solider played by John Cena [JCENA] and what looks to be the Decepticon Starscream. Bumblebee lands in theaters on December 21st.