Are you human? (Darth Aussie)NO are you OT? (Nightwing)YES Are you in the Mos Eisly Cantina? (Dark Jedi) NO Are you a droid? (Darth Aussie)NO are capable of thought? (Nightwing) YES Are you Jabba? (Darth Aussie)NO Are you PT? (Nightwing) NO Are you a Wampa? (Darth Aussie)NO Are you seen in more than one film? (bedlam412)NO Are you in Empire? (Darth Aussie)YES Are you a bounty hunter? (Nightwing)YES Are you Zuckuss? (DarthSkelington)NO Are you Bossk? (Darth Aussie)YES Are you 4-LOM? (Nightwing)NO
Ooh....caught you in a technicality Bossk was in Jabba's Palace during ROTJ. I don't recall whether or not he shows up on-screen though. Yes....I'm being anal.
To the best of my knowledge, he only appears in ESB. I checked a couple of sources on that one. Although he is connected to Jabba, I could find no reference of him appearing in ROTJ.
Let me know if you can find him on-screen in ROTJ.
Bossk was filmed in Jabba's Palace during the original, along with (independently) Boba Fett and Dengar. Thus he could be in both the original and SE. Whether he shows up on screen requires research, though.