Earlier today, the WWE Vault YouTube channel posted a video compilation of Sid (Sid Vicious/Sid Justice) and his appearances in ECW. He wrestled in ECW in 1999.
Sid was one of the few WWF/WWE champions who also wrestled in ECW. Here is the short list of these champions, listed alphabetically:
- Bret Hart (* appeared in the main event against Terry Funk at the 1997 Wrestle Fest, and the event was promoted by ECW where Funk was presented with an honorary lifetime ECW championship title before the match)
- Cactus Jack (in then-WWF as Mankind)
- Chris Benoit
- Chris Jericho
- Eddie Guerrero
- Ivan Koloff
- Kurt Angle (no matches in ECW, but he did color commentary on ECW TV with Joey Styles at the ECW Arena)
- Rey Mysterio
- Rob Van Dam
- Sid
- Steve Austin (in ECW as Superstar Steve Austin)
Note that Bob Backlund appeared in the crowd at an ECW show in 2000, but it was unannounced as he - supposedly - wanted to address the crowd regarding his political ambitions at the time.