Gillberg made a surprise appearance on Monday night's edition of WWE Raw during the "Festival of Friendship" segment between United States Champion Chris Jericho and Universal Champion Kevin Owens.
During the segment, Jericho appeared to call out Goldberg, and as Goldberg's music played, Gillberg made his way out instead, only to be attacked by Owens before he reached the ring.
It was previously reported that Gillberg would be returning to WWE, though it was not known at the time exactly when he would be returning.
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