Arrow — “Trust But Verify” — Image AR111b_0275b — Pictured: Susanna Thompson as Moira — Photo: Jack Rowand/The CW — ©2013 The CW Network. All Rights Reserved

Arrow is getting ready for a big milestone. The 100th episode for the CW series will air in December. It has already been revealed that fans will see the return of Deathstroke. Oliver’s father is also set to return in some mysterious way.

Entertainment Weekly has now reported that fans will also see Oliver’s mother pop up. Susanna Thompson is reprising her role. Her character was killed off by Deathstroke during season two of Arrow.

The news outlet did not reveal how she will appear. Fans will need to tune in for the big episode later this year.

Arrow will premiere season five on Wednesday night on CW. Are you excited for episode 100? Tell us what you think.