After a decade spent in silence, the Men in Black franchise returns to complete the trilogy... or possibly add to the tetralogy, it's not certain yet. Agents J and K are back and ready for action -- that is until K vanishes without a trace. When Agent J looks for him, the man is nowhere to be found. It's like disappeared from history altogether. Soon after, J gets an even worse bit of news. His partner died... many years ago. It's time to add time travel to the Men in Black canon.