The crash happened about 5:08 a.m. on the freeway in the area of the 75th Street SE overpass, said trooper Mark Francis with the Washington State Patrol.
Witnesses at the scene said the man appeared to be trying to cross I-5. A driver in a Ford F-150 pickup truck saw the man and tried to swerve, Francis said.
The truck's passenger side mirror struck the man.
Another southbound car then struck the man, Francis said.
The man was taken to Harborview Medical Center in Seattle. Troopers were waiting on updated details from the hospital, Francis said.
The injured man was "very critical" but breathing, Francis said.
Troopers had not yet confirmed his age or hometown.
Traffic was backed up for about two hours, including surface streets in Everett as commuters sought alternate routes.
The investigation is ongoing.
View Crash, 3-26-13 in a larger map
More Local News Headlines
With low recidivism, mental health court shows progress County Council sets hearing on Paine Field museums proposal Mukilteo School District puts 6-year capital levy on ballot Glacier Peak arson probe continues after 9 months Police, parks in Lake Stevensí 2016 budget Volunteers at Edmonds church assemble meal to be thankful for Fire closes Everett toy store; no one hurt New administrator, new energy for Oak Harbor seniors
Our new comment system is not supported in IE 7. Please upgrade your browser here.