Sullivan-Brown enters the portal with one year of eligibility remaining.
Following offseason shoulder surgery, Dread says he's focused on getting healthy to run things back with the Nittany Lions.
Imes is the second commit in the class of 2023, joining Braeden Shrewsberry.
"Penn State is a special place and one of the most iconic brands in collegiate athletics," said Altius Vice President of Collegiate Partnerships Andrew Donovan.
Harrar will help represent both the Nittany Lions and the Big Ten at the three-on-three tournament.
"Being nice doesn't cost you a damn thing."