Watch: Shkodran Mustafi stops Theo Walcott scoring with brilliant tackle
Walcott ended a 12-year association with Arsenal last month as he departed for Everton in a £20million deal.
The forward had enjoyed a bright start to his Toffees career, scoring a brace on his second appearance to fire his new club to a 2-1 victory over Leicester City.
But Walcott’s return to north London could hardly have gone any worse as Sam Allardyce’s men were thumped 5-1 by the Gunners.
Aaron Ramsey’s hat-trick, Laurent Koscielny’s header and a debut goal from Pierre-Emerick Aubameyang piled the misery on Everton, who bagged a consolation through Dominic Calvert-Lewin.
Walcott did have a great chance to score with the score at 3-0, only for Shkodran Mustafi to get back brilliantly to thwart his former team-mate.
The Germany international definitely seemed to enjoy this.