Terry Carter (left) as Col. Tigh, with Adama (Lorne Greene), in Battlestar Galactica (1978). You can see a bandage on Carter’s left foot in this photo.

Carter was originally cast as Boomer, but an injury to his foot (done while roller-skating IIRC) prevented him from taking the role. Producer Glen Larson still wanted Carter, so he cast him as Tigh, which Carter thought was a better part. In other scenes, they put something black over the cast to disguise it.