The Return of Captain Invincible tries too hard to be something really wacky and crazy and subversive as a spoof on super heroes, but it doesn't (ahem) fly. Some of it may just be my fault, that the film reminded me just too much of other films (the opening newsreel, for example, is so much like The Incredibles as to boggle the mind thinking Brad Bird may have even watched this for inspiration, and don't get me started on the flying scenes with Invincible). But some of it falls on the director, Philippe Mora, and even on Alan Arkin. I usually enjoy Arkin a lot in his performances, and can be very funny and affecting in roles. Here he's not given a whole lot to make Invincible worth trying to make likable (an ex-drunk brought back into service and is a big-ass magnet who can sometimes but not always fly) or worth a damn. And, a bigger problem, he's just not that funny in the part.
True, little things do make up for it... or make that one big thing, and that's Christopher Lee. As Mr. Midnight, a diabolical villain with a deformed creature as his minion and with lots of baddies and other mass weapons at his disposal (and a bad-ass cave with diagrams of New York City to boot), he steals the show. This is putting it mildly, perhaps, since there isn't much show to steal from him. Mora tries to build around his two leads with a lot of awkward pacing and jokes that fall flat (the 'Bull-s***' song by one of the generals in the war room is overreaching), and at other times dialog is just off-balance alongside the directing.
Another problem is this: if you have a kooky comedy-musical, make good songs, that's it, or at least have interesting musical numbers. The song cues that come up here are just badly staged and not clever or entertaining... that is, except for the ones where Christopher Lee shows up. This isn't simply a case of favoritism, though Lee is amazing when given a small opportunity. He somehow gets the material better than even the director does, and when he puts on those two numbers in his cave (or one and a half if you count the one where he and Arkin split the number), one of which near the end and all about making fun of Invincible for being a drunk and tempting him, it's brilliance! If you must, if nothing else, do watch his scenes on Youtube; perhaps someone will do everyone a favor and edit together Lee's scenes, which is worth stopping doing whatever it is at any moment of the day to watch and absorb.
The rest of the film, sadly, is kind of a bust. It's too dull, lifeless, and Mora, for all of his little tricks with the camera (a dutch angle here and there, some intentionally silly green-screen effects) can't overcome the material being so wobbily and uninteresting. If you have to watch a comedy about a drunk superhero, just watch Hancock - or (if you're reading this post 2014) Birdman.