My favorite of his stuff was probably his work on the Star Trek:TNG book for DC.
I loved the "Modala Imperative" miniseries because it featured the crew in their sixties togs, with the flip-top communicators and the women with beehive hairdos, and so forth.
DC Star Trek comics tended to feature the movie and post-movie adventures of Kirk and company; and while sometimes this was downright fascinating (the stories that had Sulu as captain and Janice Rand as first officer for instance) but come MODALA, I was really, really itching to see Kirk and the gang kick it old school style, 'rasslin giant lizards and fighting the Tholians.
One STAR TREK issue I wholeheartedly recommend is STAR TREK ANNUAL 1992, which is about a planet whose civilization was created by a race of giant telepathic elk that founded their society, and so Kirk and company follow clues inside their ancient ruins to seek the mysterious present location of the "Skylord" herds. It had a "Chariots of the Gods?" vibe, and a guest-appearance by Sarek, not to mention the cover was by Frank Kelly Freas.
The Pablo Marcos Next Generation part of the Modala Imperative story was great because it featured the "scary" Ferengi of that race's first few appearances: with furry outfits and laser-whips. What the heck happened to the Ferengi, anyway? Here was possibly the scariest Trek bad guy race since the Romulans and they were squandered away IN THE VERY FIRST SEASON no less, into comic relief. Sure, there have been some concepts in Trek that over time have fallen into disuse, but it's the difference between teen alcoholism and spiking your baby's bottle with schlitz.
Namor and Doom were another story of course; Marvel's A-number-1 master of nastiness and its prototype "am I good or am I bad" nutjob working together. Just explaining why any two Marvel baddies would work together was a story in itself, whereas DC villains had a long history of throwing in together. I can't even remember if I read any of the Team-Up books, but the covers were always inticing (well, until the last few with the team of the Red Skull and the Hate Monger! I have to wonder if that didn't help inspire the junior edition of the Klan that sprang up in the town I was living in in 1976...I kid you not!)
SUPER-VILLAIN TEAM-UP in its short run was absolutely marvelous, and, I would argue, one of the fifteen best Marvel comics ever. Sure, the writers and artists changed more often than James Bond changes dames, but what was most interesting was it managed to maintain a great quality of excellence. There was Tony Isabella's stories involving Krang taking over Hydrobase with the Octomeks and capturing Namor's 40s girlfriend Betty Dean Prentiss, the Steve Englehart stories featuring a guest appearance by Henry Kissinger (when they said a "Guest Star you wouldn't believe, brother, they MEANT it!) the Bill Mantlo issues where Doctor Doom duels the Red Skull on the Moon, and the Mike Sekowsky-drawn issues that features the return of the Doomsman robot as Andro, Lord of the Androids. Incidentally, I always wondered why Doctor Doom's androids looked like Amazo; well, there's the answer: Mike Sekowsky.
As usual, Steve Englehart, arguably the greatest writer in the history of superhero comics, was first among equals on this run: he made Namor pitiable, aged, and tragic instead of being proud or mindless. "I have lived a long time, and I have no regrets," he says. "But I do not wish to be Doctor Doom's slave."
The Mantlo issues, too, were a real treat, especially the tie-in issues with CHAMPIONS featuring Magneto mind-controlling the world. It is unfortunate because of licensing issues (namely, the appearance by Godzilla) that CHAMPIONS may never be reprinted, in Essential form or otherwise. This bugs me; they're doing ESSENTIAL KILLRAVEN (a contradiction in terms if I ever heard one) but never one of the defining comics strips of the 1970s, as well as Mantlo's career?
If you can get the ESSENTIAL SUPER-VILLAIN TEAM-UP, I strongly recommend it. It is by far the most complete Essential I have ever bought. Not only does it feature the entire run of the series from start to finish, it also has the Wally Wood/Roy Thomas "Doctor Doom, Master of Menace" stories in ASTONISHING TALES (to which the Englehart issues were a direct sequel), both issues of GIANT SIZED SUPER-VILLAIN TEAM-UP, the issues of AVENGERS by Gerry Conway that tie directly into the events of Team-Up, and the issues of CHAMPIONS as well. Not bad for $15!
Is it just me, or is Doctor Doom calling out for a Broadway musical treatment? Surely there must be a million songs they can do where the chorus line is "They will pay/ALL OF MANKIND WILL PAY!"