Wow. I'm thinking right now that it's the culmination of all comic-book stories ever.! It was ... Wow ... ... ... And it opened my mind to the reality of 'the spiritual' that we thought was 'only imaginary'---what IS imagination ... how is 'everything we think is real' NOT imagined? I mean, we have to "imagine" everything we see, hear, smell/taste and touch---and when we 'see' it with two-or-three of those senses, our brains usually accept it as "reality." ...
... I know it's a bit of a 'tangent' from "reviewing S.I.T.SV.," but a) I've been learning a song by Mercy Me that starts out, "In my imagination, it hits me all the time ..." (Mercy Me is the band who sings that song "(I can only) Imagine," so you can see how that opening line stuck with me),
and b) a tagline that the movie's Peter Parker kept telling the new Spiderman (Miles Moralez) was, "It's a leap of faith" (when you gain a new power and you're not sure you're ready to use it). When Miles told Peter that right before he let him go back into the quantum wormhole, it struck me how much the Peter Parker character looked like Scott Bakula (who played the time-traveler in Q UANTUM LEAP)---the movie WAS a cartoon, and Peter Parker was voiced by Chris Pine (who ALSO played the captain of STAR TREK's Enterprise ... hmm, have YOU ever seen Scott Bakula & Chris Pine in the same room?...)
Anyway, I think S.I.T.SV. was Stan Lee's last cameo (unless they CGI him in like STAR WARS did with Carrie Fisher in ROGUE ONE), and it ended with what I think was the moral of his whole collection of comic-book stories: "That person who helps others simply because it should or must be done, and because it is the right thing to do, is indeed, without a doubt, a real superhero."