Speaking to MTV News, Goyer confirmed that the Somalian boy from episode three will be making a return as an adult.
"We have already written that character as an adult," he said. "We're hoping to have a certain actor play him. We haven't nailed it down yet, but we're crossing our fingers."
Michael Ealy will also be arriving in the role of Miles Fogel, who Goyer said will be a "new thorn in Detective Benford's side". The character is expected to become a series regular from episode ten.
The ninth episode, titled 'Believe', will explore Bryce's vision and introduce viewers to the Japanese woman he saw.
"That's the subject of episode nine, which is almost entirely his episode. We introduce another of our cast members in that one - her name is Keiko. She's from Japan, and I can't say too much more about who she is, but she's involved in Bryce's story."
FlashForward continues Thursday at 8pm on ABC in the US and Monday at 9pm on Five in the UK.