Johnston scored a goal, blocked two shots and added two PIM in Sunday's 2-0 win over the Kraken.
Johnston had the Stars' second goal, firing in a shot from the right circle just 13 seconds after Sam Steel put the home team on the board in the first period. The 21-year-old Johnston has a goal, two assists, five shots on net, three blocked shots and a plus-3 rating over three contests this season. He continues to play key minutes while filling a third-line center role, which isn't a problem on a team as deep as Dallas.