イェンス・ヨハンソン
"Lock Up the Wolves" sessions initially included Jimmy Bain, Vinny Appice and Jens Johansson. This line-up had already written and recorded parts of "Lock Up the Wolves" before Bain and Appice were replaced with Teddy Cook and former AC/DC drummer Simon Wright, respectively. The album was released on 15 May 1990, and the band embarked on a tour in support of the album.