The Black Knight story is certainly the high spot in these books, by far. But the first Otherworld story featuring the Star Sceptre (CB 33-36) really stands out and the Captain America team-up was quite the epic to my 9 year old self and still holds up as a good read today. I remember being disappointed when the colour went away, but if you're going to go b/w then getting John Buscema and Tom Palmer on the art really sweetens the pill.