Following the formation of P&O Stena Line, the "Stena Invicta" was laid up on 1998-02-18. In April of the same year she was chartered to Silja Line, Finland for the duration of the 1998 northern hemisphere summer season. Her registered name remained "Stena Invicta", but in Silja Line marketing the ship was referred to with the name "Wasa Jubilee" in honour of the 50th anniversary of ferry operations from Vaasa, Finland. The marketing name "Wasa Jubilee" was also painted in large letters on the ship's side, alongside the company name. The ship stayed in Vaasa—Umeå service for Silja Line from 1998-04-20 until 1998-09-15. The following month the "Stena Invicta" arrived in Zeebrugge, where she was laid up. In November 1999 her registered owners were changed from Stena Line to P&O Stena Line. In December she was chartered to Stena Line U.K., entering service on the Holyhead—Dún Laoghaire route on 1999-12-12. At the end of February 2000 her route was changed to Fishguard—Rosslare, but she was withdrawn from service already on 2000-03-20.