Colin Ferguson is headed to Haven.
The former Eureka mainstay will appear on the Syfy favorite as William, described by network sources to Deadline as a "mysterious stranger" with a "secret agenda" that somehow takes him into the heart of the titular town.
Haven Season 4 began production this week in Halifax.
It will pick up six months after the events that concludes Haven Season 3, which were highlighted by the town facing a by a violent meteor storm.
Ferguson, meanwhile, headlined Eureka for all of its five seasons, portraying Sheriff Jack Carter and also serving as a producer on the series.